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Finding the Fourth Proportional to 71.39, 98.38 and 61.04

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Solution

The fourth proportional to 71.39, 98.38 and 61.04 is: 84.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.39 : 98.38 = 61.04 : x
  2. Step 2: Convert to fraction form
    71.39/98.38 = 61.04/x
  3. Step 3: Cross multiply
    71.39x = 98.38 × 61.04
  4. Step 4: Simplify right side
    71.39x = 6,005.12
  5. Step 5: Solve for x
    x = 6,005.12/71.39
  6. Step 6: Final answer
    x = 84.12

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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.