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Finding the Fourth Proportional to 83,280.80, 124,775.40 and 68,409.20

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Solution

The fourth proportional to 83,280.80, 124,775.40 and 68,409.20 is: 102,494.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,280.80 : 124,775.40 = 68,409.20 : x
  2. Step 2: Convert to fraction form
    83,280.80/124,775.40 = 68,409.20/x
  3. Step 3: Cross multiply
    83,280.80x = 124,775.40 × 68,409.20
  4. Step 4: Simplify right side
    83,280.80x = 8,535,785,293.68
  5. Step 5: Solve for x
    x = 8,535,785,293.68/83,280.80
  6. Step 6: Final answer
    x = 102,494.04

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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.