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Finding the Fourth Proportional to 84,121.12, 126,033.20 and 74,968.48

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Solution

The fourth proportional to 84,121.12, 126,033.20 and 74,968.48 is: 112,320.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,121.12 : 126,033.20 = 74,968.48 : x
  2. Step 2: Convert to fraction form
    84,121.12/126,033.20 = 74,968.48/x
  3. Step 3: Cross multiply
    84,121.12x = 126,033.20 × 74,968.48
  4. Step 4: Simplify right side
    84,121.12x = 9,448,517,433.54
  5. Step 5: Solve for x
    x = 9,448,517,433.54/84,121.12
  6. Step 6: Final answer
    x = 112,320.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.