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Finding the Fourth Proportional to 515,332.76, 711,166.54 and 311,355.32

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Solution

The fourth proportional to 515,332.76, 711,166.54 and 311,355.32 is: 429,674.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,332.76 : 711,166.54 = 311,355.32 : x
  2. Step 2: Convert to fraction form
    515,332.76/711,166.54 = 311,355.32/x
  3. Step 3: Cross multiply
    515,332.76x = 711,166.54 × 311,355.32
  4. Step 4: Simplify right side
    515,332.76x = 221,425,485,634.99
  5. Step 5: Solve for x
    x = 221,425,485,634.99/515,332.76
  6. Step 6: Final answer
    x = 429,674.77

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.