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Finding the Fourth Proportional to 91.89, 126.80 and 50.44

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Solution

The fourth proportional to 91.89, 126.80 and 50.44 is: 69.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.89 : 126.80 = 50.44 : x
  2. Step 2: Convert to fraction form
    91.89/126.80 = 50.44/x
  3. Step 3: Cross multiply
    91.89x = 126.80 × 50.44
  4. Step 4: Simplify right side
    91.89x = 6,395.79
  5. Step 5: Solve for x
    x = 6,395.79/91.89
  6. Step 6: Final answer
    x = 69.60

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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.