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Finding the Fourth Proportional to 139.26, 191.90 and 92.58

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Solution

The fourth proportional to 139.26, 191.90 and 92.58 is: 127.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.26 : 191.90 = 92.58 : x
  2. Step 2: Convert to fraction form
    139.26/191.90 = 92.58/x
  3. Step 3: Cross multiply
    139.26x = 191.90 × 92.58
  4. Step 4: Simplify right side
    139.26x = 17,766.10
  5. Step 5: Solve for x
    x = 17,766.10/139.26
  6. Step 6: Final answer
    x = 127.58

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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.