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Finding the Fourth Proportional to 71.75, 99.12 and 61.02

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Solution

The fourth proportional to 71.75, 99.12 and 61.02 is: 84.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.75 : 99.12 = 61.02 : x
  2. Step 2: Convert to fraction form
    71.75/99.12 = 61.02/x
  3. Step 3: Cross multiply
    71.75x = 99.12 × 61.02
  4. Step 4: Simplify right side
    71.75x = 6,048.53
  5. Step 5: Solve for x
    x = 6,048.53/71.75
  6. Step 6: Final answer
    x = 84.30

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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.