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Finding the Fourth Proportional to 355.39, 532.87 and 138.71

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Solution

The fourth proportional to 355.39, 532.87 and 138.71 is: 207.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.39 : 532.87 = 138.71 : x
  2. Step 2: Convert to fraction form
    355.39/532.87 = 138.71/x
  3. Step 3: Cross multiply
    355.39x = 532.87 × 138.71
  4. Step 4: Simplify right side
    355.39x = 73,914.40
  5. Step 5: Solve for x
    x = 73,914.40/355.39
  6. Step 6: Final answer
    x = 207.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.