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Finding the Fourth Proportional to 71.98, 99.28 and 58.18

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Solution

The fourth proportional to 71.98, 99.28 and 58.18 is: 80.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.98 : 99.28 = 58.18 : x
  2. Step 2: Convert to fraction form
    71.98/99.28 = 58.18/x
  3. Step 3: Cross multiply
    71.98x = 99.28 × 58.18
  4. Step 4: Simplify right side
    71.98x = 5,776.11
  5. Step 5: Solve for x
    x = 5,776.11/71.98
  6. Step 6: Final answer
    x = 80.25

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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.