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Finding the Fourth Proportional to 91.32, 126.53 and 90.15

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Solution

The fourth proportional to 91.32, 126.53 and 90.15 is: 124.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.32 : 126.53 = 90.15 : x
  2. Step 2: Convert to fraction form
    91.32/126.53 = 90.15/x
  3. Step 3: Cross multiply
    91.32x = 126.53 × 90.15
  4. Step 4: Simplify right side
    91.32x = 11,406.68
  5. Step 5: Solve for x
    x = 11,406.68/91.32
  6. Step 6: Final answer
    x = 124.91

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.