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Finding the Fourth Proportional to 139.74, 192.96 and 96.18

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Solution

The fourth proportional to 139.74, 192.96 and 96.18 is: 132.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.74 : 192.96 = 96.18 : x
  2. Step 2: Convert to fraction form
    139.74/192.96 = 96.18/x
  3. Step 3: Cross multiply
    139.74x = 192.96 × 96.18
  4. Step 4: Simplify right side
    139.74x = 18,558.89
  5. Step 5: Solve for x
    x = 18,558.89/139.74
  6. Step 6: Final answer
    x = 132.81

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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.