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Finding the Fourth Proportional to 71.12, 97.86 and 61.88

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Solution

The fourth proportional to 71.12, 97.86 and 61.88 is: 85.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.12 : 97.86 = 61.88 : x
  2. Step 2: Convert to fraction form
    71.12/97.86 = 61.88/x
  3. Step 3: Cross multiply
    71.12x = 97.86 × 61.88
  4. Step 4: Simplify right side
    71.12x = 6,055.58
  5. Step 5: Solve for x
    x = 6,055.58/71.12
  6. Step 6: Final answer
    x = 85.15

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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.