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Finding the Fourth Proportional to 666.91, 920.27 and 387.24

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Solution

The fourth proportional to 666.91, 920.27 and 387.24 is: 534.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.91 : 920.27 = 387.24 : x
  2. Step 2: Convert to fraction form
    666.91/920.27 = 387.24/x
  3. Step 3: Cross multiply
    666.91x = 920.27 × 387.24
  4. Step 4: Simplify right side
    666.91x = 356,365.35
  5. Step 5: Solve for x
    x = 356,365.35/666.91
  6. Step 6: Final answer
    x = 534.35

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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.