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Finding the Fourth Proportional to 91.88, 137.78 and 77.53

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Solution

The fourth proportional to 91.88, 137.78 and 77.53 is: 116.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.88 : 137.78 = 77.53 : x
  2. Step 2: Convert to fraction form
    91.88/137.78 = 77.53/x
  3. Step 3: Cross multiply
    91.88x = 137.78 × 77.53
  4. Step 4: Simplify right side
    91.88x = 10,681.70
  5. Step 5: Solve for x
    x = 10,681.70/91.88
  6. Step 6: Final answer
    x = 116.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.