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Finding the Fourth Proportional to 92.20, 137.71 and 79.40

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Solution

The fourth proportional to 92.20, 137.71 and 79.40 is: 118.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.20 : 137.71 = 79.40 : x
  2. Step 2: Convert to fraction form
    92.20/137.71 = 79.40/x
  3. Step 3: Cross multiply
    92.20x = 137.71 × 79.40
  4. Step 4: Simplify right side
    92.20x = 10,934.17
  5. Step 5: Solve for x
    x = 10,934.17/92.20
  6. Step 6: Final answer
    x = 118.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.