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Finding the Fourth Proportional to 139.28, 192.06 and 113

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Solution

The fourth proportional to 139.28, 192.06 and 113 is: 155.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.28 : 192.06 = 113 : x
  2. Step 2: Convert to fraction form
    139.28/192.06 = 113/x
  3. Step 3: Cross multiply
    139.28x = 192.06 × 113
  4. Step 4: Simplify right side
    139.28x = 21,702.78
  5. Step 5: Solve for x
    x = 21,702.78/139.28
  6. Step 6: Final answer
    x = 155.82

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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.