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Finding the Fourth Proportional to 139.61, 192.13 and 131.11

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Solution

The fourth proportional to 139.61, 192.13 and 131.11 is: 180.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.61 : 192.13 = 131.11 : x
  2. Step 2: Convert to fraction form
    139.61/192.13 = 131.11/x
  3. Step 3: Cross multiply
    139.61x = 192.13 × 131.11
  4. Step 4: Simplify right side
    139.61x = 25,190.16
  5. Step 5: Solve for x
    x = 25,190.16/139.61
  6. Step 6: Final answer
    x = 180.43

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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.