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Finding the Fourth Proportional to 71.89, 99.16 and 42.75

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Solution

The fourth proportional to 71.89, 99.16 and 42.75 is: 58.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.89 : 99.16 = 42.75 : x
  2. Step 2: Convert to fraction form
    71.89/99.16 = 42.75/x
  3. Step 3: Cross multiply
    71.89x = 99.16 × 42.75
  4. Step 4: Simplify right side
    71.89x = 4,238.98
  5. Step 5: Solve for x
    x = 4,238.98/71.89
  6. Step 6: Final answer
    x = 58.97

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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.