Home / 80,682.40-121,315.20-78,932.80

Finding the Fourth Proportional to 80,682.40, 121,315.20 and 78,932.80

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Solution

The fourth proportional to 80,682.40, 121,315.20 and 78,932.80 is: 118,684.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,682.40 : 121,315.20 = 78,932.80 : x
  2. Step 2: Convert to fraction form
    80,682.40/121,315.20 = 78,932.80/x
  3. Step 3: Cross multiply
    80,682.40x = 121,315.20 × 78,932.80
  4. Step 4: Simplify right side
    80,682.40x = 9,575,748,418.56
  5. Step 5: Solve for x
    x = 9,575,748,418.56/80,682.40
  6. Step 6: Final answer
    x = 118,684.48

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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.