Home / 78,684.20-108,520.26-72,124.28

Finding the Fourth Proportional to 78,684.20, 108,520.26 and 72,124.28

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Solution

The fourth proportional to 78,684.20, 108,520.26 and 72,124.28 is: 99,472.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,684.20 : 108,520.26 = 72,124.28 : x
  2. Step 2: Convert to fraction form
    78,684.20/108,520.26 = 72,124.28/x
  3. Step 3: Cross multiply
    78,684.20x = 108,520.26 × 72,124.28
  4. Step 4: Simplify right side
    78,684.20x = 7,826,945,617.91
  5. Step 5: Solve for x
    x = 7,826,945,617.91/78,684.20
  6. Step 6: Final answer
    x = 99,472.90

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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.