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Finding the Fourth Proportional to 387.39, 534.70 and 239.94

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Solution

The fourth proportional to 387.39, 534.70 and 239.94 is: 331.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.39 : 534.70 = 239.94 : x
  2. Step 2: Convert to fraction form
    387.39/534.70 = 239.94/x
  3. Step 3: Cross multiply
    387.39x = 534.70 × 239.94
  4. Step 4: Simplify right side
    387.39x = 128,294.72
  5. Step 5: Solve for x
    x = 128,294.72/387.39
  6. Step 6: Final answer
    x = 331.18

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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.