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Finding the Fourth Proportional to 100,439.76, 138,608 and 55,116.48

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Solution

The fourth proportional to 100,439.76, 138,608 and 55,116.48 is: 76,061.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,439.76 : 138,608 = 55,116.48 : x
  2. Step 2: Convert to fraction form
    100,439.76/138,608 = 55,116.48/x
  3. Step 3: Cross multiply
    100,439.76x = 138,608 × 55,116.48
  4. Step 4: Simplify right side
    100,439.76x = 7,639,585,059.84
  5. Step 5: Solve for x
    x = 7,639,585,059.84/100,439.76
  6. Step 6: Final answer
    x = 76,061.36

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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.