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Finding the Fourth Proportional to 139.31, 192.45 and 97.85

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Solution

The fourth proportional to 139.31, 192.45 and 97.85 is: 135.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.31 : 192.45 = 97.85 : x
  2. Step 2: Convert to fraction form
    139.31/192.45 = 97.85/x
  3. Step 3: Cross multiply
    139.31x = 192.45 × 97.85
  4. Step 4: Simplify right side
    139.31x = 18,830.74
  5. Step 5: Solve for x
    x = 18,830.74/139.31
  6. Step 6: Final answer
    x = 135.17

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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.