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Finding the Fourth Proportional to 355.30, 532.62 and 138.72

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Solution

The fourth proportional to 355.30, 532.62 and 138.72 is: 207.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.30 : 532.62 = 138.72 : x
  2. Step 2: Convert to fraction form
    355.30/532.62 = 138.72/x
  3. Step 3: Cross multiply
    355.30x = 532.62 × 138.72
  4. Step 4: Simplify right side
    355.30x = 73,885.05
  5. Step 5: Solve for x
    x = 73,885.05/355.30
  6. Step 6: Final answer
    x = 207.95

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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.