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Finding the Fourth Proportional to 71.38, 98.61 and 70.42

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Solution

The fourth proportional to 71.38, 98.61 and 70.42 is: 97.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.38 : 98.61 = 70.42 : x
  2. Step 2: Convert to fraction form
    71.38/98.61 = 70.42/x
  3. Step 3: Cross multiply
    71.38x = 98.61 × 70.42
  4. Step 4: Simplify right side
    71.38x = 6,944.12
  5. Step 5: Solve for x
    x = 6,944.12/71.38
  6. Step 6: Final answer
    x = 97.28

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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.