Home / 20,832.20-31,248.30-8,520.20

Finding the Fourth Proportional to 20,832.20, 31,248.30 and 8,520.20

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Solution

The fourth proportional to 20,832.20, 31,248.30 and 8,520.20 is: 12,780.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,832.20 : 31,248.30 = 8,520.20 : x
  2. Step 2: Convert to fraction form
    20,832.20/31,248.30 = 8,520.20/x
  3. Step 3: Cross multiply
    20,832.20x = 31,248.30 × 8,520.20
  4. Step 4: Simplify right side
    20,832.20x = 266,241,765.66
  5. Step 5: Solve for x
    x = 266,241,765.66/20,832.20
  6. Step 6: Final answer
    x = 12,780.30

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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.