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Finding the Fourth Proportional to 58.80, 81.15 and 42.42

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Solution

The fourth proportional to 58.80, 81.15 and 42.42 is: 58.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.80 : 81.15 = 42.42 : x
  2. Step 2: Convert to fraction form
    58.80/81.15 = 42.42/x
  3. Step 3: Cross multiply
    58.80x = 81.15 × 42.42
  4. Step 4: Simplify right side
    58.80x = 3,442.38
  5. Step 5: Solve for x
    x = 3,442.38/58.80
  6. Step 6: Final answer
    x = 58.54

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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.