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Finding the Fourth Proportional to 61.92, 84.71 and 61.66

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Solution

The fourth proportional to 61.92, 84.71 and 61.66 is: 84.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.92 : 84.71 = 61.66 : x
  2. Step 2: Convert to fraction form
    61.92/84.71 = 61.66/x
  3. Step 3: Cross multiply
    61.92x = 84.71 × 61.66
  4. Step 4: Simplify right side
    61.92x = 5,223.22
  5. Step 5: Solve for x
    x = 5,223.22/61.92
  6. Step 6: Final answer
    x = 84.35

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.