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Finding the Fourth Proportional to 355, 532.68 and 138.55

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Solution

The fourth proportional to 355, 532.68 and 138.55 is: 207.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    355 : 532.68 = 138.55 : x
  2. Step 2: Convert to fraction form
    355/532.68 = 138.55/x
  3. Step 3: Cross multiply
    355x = 532.68 × 138.55
  4. Step 4: Simplify right side
    355x = 73,802.81
  5. Step 5: Solve for x
    x = 73,802.81/355
  6. Step 6: Final answer
    x = 207.90

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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.