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Finding the Fourth Proportional to 91.38, 137.09 and 48.03

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Solution

The fourth proportional to 91.38, 137.09 and 48.03 is: 72.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.38 : 137.09 = 48.03 : x
  2. Step 2: Convert to fraction form
    91.38/137.09 = 48.03/x
  3. Step 3: Cross multiply
    91.38x = 137.09 × 48.03
  4. Step 4: Simplify right side
    91.38x = 6,584.43
  5. Step 5: Solve for x
    x = 6,584.43/91.38
  6. Step 6: Final answer
    x = 72.06

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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.