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Finding the Fourth Proportional to 91.29, 126 and 54.45

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Solution

The fourth proportional to 91.29, 126 and 54.45 is: 75.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.29 : 126 = 54.45 : x
  2. Step 2: Convert to fraction form
    91.29/126 = 54.45/x
  3. Step 3: Cross multiply
    91.29x = 126 × 54.45
  4. Step 4: Simplify right side
    91.29x = 6,860.70
  5. Step 5: Solve for x
    x = 6,860.70/91.29
  6. Step 6: Final answer
    x = 75.15

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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.