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Finding the Fourth Proportional to 58.31, 87.47 and 31.18

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Solution

The fourth proportional to 58.31, 87.47 and 31.18 is: 46.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.31 : 87.47 = 31.18 : x
  2. Step 2: Convert to fraction form
    58.31/87.47 = 31.18/x
  3. Step 3: Cross multiply
    58.31x = 87.47 × 31.18
  4. Step 4: Simplify right side
    58.31x = 2,726.72
  5. Step 5: Solve for x
    x = 2,726.72/58.31
  6. Step 6: Final answer
    x = 46.76

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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.