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Finding the Fourth Proportional to 71.76, 108.12 and 61.59

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Solution

The fourth proportional to 71.76, 108.12 and 61.59 is: 92.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.76 : 108.12 = 61.59 : x
  2. Step 2: Convert to fraction form
    71.76/108.12 = 61.59/x
  3. Step 3: Cross multiply
    71.76x = 108.12 × 61.59
  4. Step 4: Simplify right side
    71.76x = 6,659.11
  5. Step 5: Solve for x
    x = 6,659.11/71.76
  6. Step 6: Final answer
    x = 92.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.