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Finding the Fourth Proportional to 91.32, 126.05 and 85.55

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Solution

The fourth proportional to 91.32, 126.05 and 85.55 is: 118.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.32 : 126.05 = 85.55 : x
  2. Step 2: Convert to fraction form
    91.32/126.05 = 85.55/x
  3. Step 3: Cross multiply
    91.32x = 126.05 × 85.55
  4. Step 4: Simplify right side
    91.32x = 10,783.46
  5. Step 5: Solve for x
    x = 10,783.46/91.32
  6. Step 6: Final answer
    x = 118.08

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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.