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Finding the Fourth Proportional to 81.57, 122.35 and 58.78

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Solution

The fourth proportional to 81.57, 122.35 and 58.78 is: 88.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.57 : 122.35 = 58.78 : x
  2. Step 2: Convert to fraction form
    81.57/122.35 = 58.78/x
  3. Step 3: Cross multiply
    81.57x = 122.35 × 58.78
  4. Step 4: Simplify right side
    81.57x = 7,191.44
  5. Step 5: Solve for x
    x = 7,191.44/81.57
  6. Step 6: Final answer
    x = 88.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.