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Finding the Fourth Proportional to 515,330.76, 711,163.78 and 311,353.32

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Solution

The fourth proportional to 515,330.76, 711,163.78 and 311,353.32 is: 429,672.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,330.76 : 711,163.78 = 311,353.32 : x
  2. Step 2: Convert to fraction form
    515,330.76/711,163.78 = 311,353.32/x
  3. Step 3: Cross multiply
    515,330.76x = 711,163.78 × 311,353.32
  4. Step 4: Simplify right side
    515,330.76x = 221,423,203,966.75
  5. Step 5: Solve for x
    x = 221,423,203,966.75/515,330.76
  6. Step 6: Final answer
    x = 429,672.01

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Double scale
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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.