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Finding the Fourth Proportional to 91.56, 126.22 and 87.50

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Solution

The fourth proportional to 91.56, 126.22 and 87.50 is: 120.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.56 : 126.22 = 87.50 : x
  2. Step 2: Convert to fraction form
    91.56/126.22 = 87.50/x
  3. Step 3: Cross multiply
    91.56x = 126.22 × 87.50
  4. Step 4: Simplify right side
    91.56x = 11,044.25
  5. Step 5: Solve for x
    x = 11,044.25/91.56
  6. Step 6: Final answer
    x = 120.62

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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.