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Finding the Fourth Proportional to 91.91, 137.90 and 48.58

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Solution

The fourth proportional to 91.91, 137.90 and 48.58 is: 72.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.91 : 137.90 = 48.58 : x
  2. Step 2: Convert to fraction form
    91.91/137.90 = 48.58/x
  3. Step 3: Cross multiply
    91.91x = 137.90 × 48.58
  4. Step 4: Simplify right side
    91.91x = 6,698.69
  5. Step 5: Solve for x
    x = 6,698.69/91.91
  6. Step 6: Final answer
    x = 72.88

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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.