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Finding the Fourth Proportional to 139.04, 191.76 and 89.92

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Solution

The fourth proportional to 139.04, 191.76 and 89.92 is: 124.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.04 : 191.76 = 89.92 : x
  2. Step 2: Convert to fraction form
    139.04/191.76 = 89.92/x
  3. Step 3: Cross multiply
    139.04x = 191.76 × 89.92
  4. Step 4: Simplify right side
    139.04x = 17,243.06
  5. Step 5: Solve for x
    x = 17,243.06/139.04
  6. Step 6: Final answer
    x = 124.02

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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.