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Finding the Fourth Proportional to 355.07, 532.47 and 138.60

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Solution

The fourth proportional to 355.07, 532.47 and 138.60 is: 207.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.07 : 532.47 = 138.60 : x
  2. Step 2: Convert to fraction form
    355.07/532.47 = 138.60/x
  3. Step 3: Cross multiply
    355.07x = 532.47 × 138.60
  4. Step 4: Simplify right side
    355.07x = 73,800.34
  5. Step 5: Solve for x
    x = 73,800.34/355.07
  6. Step 6: Final answer
    x = 207.85

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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.