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Finding the Fourth Proportional to 666.62, 920.12 and 386.97

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Solution

The fourth proportional to 666.62, 920.12 and 386.97 is: 534.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.62 : 920.12 = 386.97 : x
  2. Step 2: Convert to fraction form
    666.62/920.12 = 386.97/x
  3. Step 3: Cross multiply
    666.62x = 920.12 × 386.97
  4. Step 4: Simplify right side
    666.62x = 356,058.84
  5. Step 5: Solve for x
    x = 356,058.84/666.62
  6. Step 6: Final answer
    x = 534.13

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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.