Home / 40,909.20-61,378.20-20,118.80

Finding the Fourth Proportional to 40,909.20, 61,378.20 and 20,118.80

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Solution

The fourth proportional to 40,909.20, 61,378.20 and 20,118.80 is: 30,185.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,909.20 : 61,378.20 = 20,118.80 : x
  2. Step 2: Convert to fraction form
    40,909.20/61,378.20 = 20,118.80/x
  3. Step 3: Cross multiply
    40,909.20x = 61,378.20 × 20,118.80
  4. Step 4: Simplify right side
    40,909.20x = 1,234,855,730.16
  5. Step 5: Solve for x
    x = 1,234,855,730.16/40,909.20
  6. Step 6: Final answer
    x = 30,185.28

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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.