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Finding the Fourth Proportional to 674.38, 929.28 and 487.54

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Solution

The fourth proportional to 674.38, 929.28 and 487.54 is: 671.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.38 : 929.28 = 487.54 : x
  2. Step 2: Convert to fraction form
    674.38/929.28 = 487.54/x
  3. Step 3: Cross multiply
    674.38x = 929.28 × 487.54
  4. Step 4: Simplify right side
    674.38x = 453,061.17
  5. Step 5: Solve for x
    x = 453,061.17/674.38
  6. Step 6: Final answer
    x = 671.82

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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.