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Finding the Fourth Proportional to 71.12, 98 and 66.64

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Solution

The fourth proportional to 71.12, 98 and 66.64 is: 91.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.12 : 98 = 66.64 : x
  2. Step 2: Convert to fraction form
    71.12/98 = 66.64/x
  3. Step 3: Cross multiply
    71.12x = 98 × 66.64
  4. Step 4: Simplify right side
    71.12x = 6,530.72
  5. Step 5: Solve for x
    x = 6,530.72/71.12
  6. Step 6: Final answer
    x = 91.83

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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.