Home / 20,909.12-31,380.96-8,605.76

Finding the Fourth Proportional to 20,909.12, 31,380.96 and 8,605.76

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Solution

The fourth proportional to 20,909.12, 31,380.96 and 8,605.76 is: 12,915.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.12 : 31,380.96 = 8,605.76 : x
  2. Step 2: Convert to fraction form
    20,909.12/31,380.96 = 8,605.76/x
  3. Step 3: Cross multiply
    20,909.12x = 31,380.96 × 8,605.76
  4. Step 4: Simplify right side
    20,909.12x = 270,057,010.33
  5. Step 5: Solve for x
    x = 270,057,010.33/20,909.12
  6. Step 6: Final answer
    x = 12,915.75

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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.