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Finding the Fourth Proportional to 91.43, 126.05 and 87.38

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Solution

The fourth proportional to 91.43, 126.05 and 87.38 is: 120.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.43 : 126.05 = 87.38 : x
  2. Step 2: Convert to fraction form
    91.43/126.05 = 87.38/x
  3. Step 3: Cross multiply
    91.43x = 126.05 × 87.38
  4. Step 4: Simplify right side
    91.43x = 11,013.18
  5. Step 5: Solve for x
    x = 11,013.18/91.43
  6. Step 6: Final answer
    x = 120.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.