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Finding the Fourth Proportional to 91.15, 137.41 and 87.49

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Solution

The fourth proportional to 91.15, 137.41 and 87.49 is: 131.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.15 : 137.41 = 87.49 : x
  2. Step 2: Convert to fraction form
    91.15/137.41 = 87.49/x
  3. Step 3: Cross multiply
    91.15x = 137.41 × 87.49
  4. Step 4: Simplify right side
    91.15x = 12,022.00
  5. Step 5: Solve for x
    x = 12,022.00/91.15
  6. Step 6: Final answer
    x = 131.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.