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Finding the Fourth Proportional to 59.31, 81.89 and 38.61

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Solution

The fourth proportional to 59.31, 81.89 and 38.61 is: 53.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.31 : 81.89 = 38.61 : x
  2. Step 2: Convert to fraction form
    59.31/81.89 = 38.61/x
  3. Step 3: Cross multiply
    59.31x = 81.89 × 38.61
  4. Step 4: Simplify right side
    59.31x = 3,161.58
  5. Step 5: Solve for x
    x = 3,161.58/59.31
  6. Step 6: Final answer
    x = 53.31

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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.