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Finding the Fourth Proportional to 61.17, 84.39 and 39.07

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Solution

The fourth proportional to 61.17, 84.39 and 39.07 is: 53.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.17 : 84.39 = 39.07 : x
  2. Step 2: Convert to fraction form
    61.17/84.39 = 39.07/x
  3. Step 3: Cross multiply
    61.17x = 84.39 × 39.07
  4. Step 4: Simplify right side
    61.17x = 3,296.92
  5. Step 5: Solve for x
    x = 3,296.92/61.17
  6. Step 6: Final answer
    x = 53.90

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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.