Home / 80,909.28-121,380.12-30,987.36

Finding the Fourth Proportional to 80,909.28, 121,380.12 and 30,987.36

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Solution

The fourth proportional to 80,909.28, 121,380.12 and 30,987.36 is: 46,487.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,909.28 : 121,380.12 = 30,987.36 : x
  2. Step 2: Convert to fraction form
    80,909.28/121,380.12 = 30,987.36/x
  3. Step 3: Cross multiply
    80,909.28x = 121,380.12 × 30,987.36
  4. Step 4: Simplify right side
    80,909.28x = 3,761,249,475.28
  5. Step 5: Solve for x
    x = 3,761,249,475.28/80,909.28
  6. Step 6: Final answer
    x = 46,487.24

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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.