Home / 80,860.10-121,290.15-72,403.70

Finding the Fourth Proportional to 80,860.10, 121,290.15 and 72,403.70

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Solution

The fourth proportional to 80,860.10, 121,290.15 and 72,403.70 is: 108,605.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,860.10 : 121,290.15 = 72,403.70 : x
  2. Step 2: Convert to fraction form
    80,860.10/121,290.15 = 72,403.70/x
  3. Step 3: Cross multiply
    80,860.10x = 121,290.15 × 72,403.70
  4. Step 4: Simplify right side
    80,860.10x = 8,781,855,633.56
  5. Step 5: Solve for x
    x = 8,781,855,633.56/80,860.10
  6. Step 6: Final answer
    x = 108,605.55

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1.5x scale

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.