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Finding the Fourth Proportional to 58.47, 87.66 and 31.38

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Solution

The fourth proportional to 58.47, 87.66 and 31.38 is: 47.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.47 : 87.66 = 31.38 : x
  2. Step 2: Convert to fraction form
    58.47/87.66 = 31.38/x
  3. Step 3: Cross multiply
    58.47x = 87.66 × 31.38
  4. Step 4: Simplify right side
    58.47x = 2,750.77
  5. Step 5: Solve for x
    x = 2,750.77/58.47
  6. Step 6: Final answer
    x = 47.05

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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.