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Finding the Fourth Proportional to 104.38, 156.55 and 39.39

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Solution

The fourth proportional to 104.38, 156.55 and 39.39 is: 59.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.38 : 156.55 = 39.39 : x
  2. Step 2: Convert to fraction form
    104.38/156.55 = 39.39/x
  3. Step 3: Cross multiply
    104.38x = 156.55 × 39.39
  4. Step 4: Simplify right side
    104.38x = 6,166.28
  5. Step 5: Solve for x
    x = 6,166.28/104.38
  6. Step 6: Final answer
    x = 59.07

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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.