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Finding the Fourth Proportional to 666.73, 920.28 and 387.15

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Solution

The fourth proportional to 666.73, 920.28 and 387.15 is: 534.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.73 : 920.28 = 387.15 : x
  2. Step 2: Convert to fraction form
    666.73/920.28 = 387.15/x
  3. Step 3: Cross multiply
    666.73x = 920.28 × 387.15
  4. Step 4: Simplify right side
    666.73x = 356,286.40
  5. Step 5: Solve for x
    x = 356,286.40/666.73
  6. Step 6: Final answer
    x = 534.38

Related Problems

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Half scale
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Double scale
Find fourth proportional to 667.73, 921.66 and 388.15
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.