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Finding the Fourth Proportional to 87.93, 121.31 and 58.39

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Solution

The fourth proportional to 87.93, 121.31 and 58.39 is: 80.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.93 : 121.31 = 58.39 : x
  2. Step 2: Convert to fraction form
    87.93/121.31 = 58.39/x
  3. Step 3: Cross multiply
    87.93x = 121.31 × 58.39
  4. Step 4: Simplify right side
    87.93x = 7,083.59
  5. Step 5: Solve for x
    x = 7,083.59/87.93
  6. Step 6: Final answer
    x = 80.56

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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.