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Finding the Fourth Proportional to 91.58, 126.39 and 54.75

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Solution

The fourth proportional to 91.58, 126.39 and 54.75 is: 75.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.58 : 126.39 = 54.75 : x
  2. Step 2: Convert to fraction form
    91.58/126.39 = 54.75/x
  3. Step 3: Cross multiply
    91.58x = 126.39 × 54.75
  4. Step 4: Simplify right side
    91.58x = 6,920.53
  5. Step 5: Solve for x
    x = 6,920.53/91.58
  6. Step 6: Final answer
    x = 75.57

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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.