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Finding the Fourth Proportional to 1,550.32, 2,139.15 and 920.68

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Solution

The fourth proportional to 1,550.32, 2,139.15 and 920.68 is: 1,270.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.32 : 2,139.15 = 920.68 : x
  2. Step 2: Convert to fraction form
    1,550.32/2,139.15 = 920.68/x
  3. Step 3: Cross multiply
    1,550.32x = 2,139.15 × 920.68
  4. Step 4: Simplify right side
    1,550.32x = 1,969,472.62
  5. Step 5: Solve for x
    x = 1,969,472.62/1,550.32
  6. Step 6: Final answer
    x = 1,270.37

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Half scale
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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.