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Finding the Fourth Proportional to 91.98, 138.12 and 79.26

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Solution

The fourth proportional to 91.98, 138.12 and 79.26 is: 119.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.98 : 138.12 = 79.26 : x
  2. Step 2: Convert to fraction form
    91.98/138.12 = 79.26/x
  3. Step 3: Cross multiply
    91.98x = 138.12 × 79.26
  4. Step 4: Simplify right side
    91.98x = 10,947.39
  5. Step 5: Solve for x
    x = 10,947.39/91.98
  6. Step 6: Final answer
    x = 119.02

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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.