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Finding the Fourth Proportional to 91.90, 137.87 and 31.04

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Solution

The fourth proportional to 91.90, 137.87 and 31.04 is: 46.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.90 : 137.87 = 31.04 : x
  2. Step 2: Convert to fraction form
    91.90/137.87 = 31.04/x
  3. Step 3: Cross multiply
    91.90x = 137.87 × 31.04
  4. Step 4: Simplify right side
    91.90x = 4,278.64
  5. Step 5: Solve for x
    x = 4,278.64/91.90
  6. Step 6: Final answer
    x = 46.56

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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.