Home / 99,761.15-137,672.36-78,276.65

Finding the Fourth Proportional to 99,761.15, 137,672.36 and 78,276.65

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Solution

The fourth proportional to 99,761.15, 137,672.36 and 78,276.65 is: 108,023.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,761.15 : 137,672.36 = 78,276.65 : x
  2. Step 2: Convert to fraction form
    99,761.15/137,672.36 = 78,276.65/x
  3. Step 3: Cross multiply
    99,761.15x = 137,672.36 × 78,276.65
  4. Step 4: Simplify right side
    99,761.15x = 10,776,530,352.19
  5. Step 5: Solve for x
    x = 10,776,530,352.19/99,761.15
  6. Step 6: Final answer
    x = 108,023.31

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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.