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Finding the Fourth Proportional to 666.92, 921.17 and 471.31

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Solution

The fourth proportional to 666.92, 921.17 and 471.31 is: 650.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.92 : 921.17 = 471.31 : x
  2. Step 2: Convert to fraction form
    666.92/921.17 = 471.31/x
  3. Step 3: Cross multiply
    666.92x = 921.17 × 471.31
  4. Step 4: Simplify right side
    666.92x = 434,156.63
  5. Step 5: Solve for x
    x = 434,156.63/666.92
  6. Step 6: Final answer
    x = 650.99

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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.