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Finding the Fourth Proportional to 61.13, 84.15 and 52.90

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Solution

The fourth proportional to 61.13, 84.15 and 52.90 is: 72.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.13 : 84.15 = 52.90 : x
  2. Step 2: Convert to fraction form
    61.13/84.15 = 52.90/x
  3. Step 3: Cross multiply
    61.13x = 84.15 × 52.90
  4. Step 4: Simplify right side
    61.13x = 4,451.54
  5. Step 5: Solve for x
    x = 4,451.54/61.13
  6. Step 6: Final answer
    x = 72.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.