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Finding the Fourth Proportional to 71.13, 98.02 and 66.50

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Solution

The fourth proportional to 71.13, 98.02 and 66.50 is: 91.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.13 : 98.02 = 66.50 : x
  2. Step 2: Convert to fraction form
    71.13/98.02 = 66.50/x
  3. Step 3: Cross multiply
    71.13x = 98.02 × 66.50
  4. Step 4: Simplify right side
    71.13x = 6,517.83
  5. Step 5: Solve for x
    x = 6,517.83/71.13
  6. Step 6: Final answer
    x = 91.64

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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.