Home / 20,885.10-31,327.20-13,909.80

Finding the Fourth Proportional to 20,885.10, 31,327.20 and 13,909.80

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Solution

The fourth proportional to 20,885.10, 31,327.20 and 13,909.80 is: 20,864.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.10 : 31,327.20 = 13,909.80 : x
  2. Step 2: Convert to fraction form
    20,885.10/31,327.20 = 13,909.80/x
  3. Step 3: Cross multiply
    20,885.10x = 31,327.20 × 13,909.80
  4. Step 4: Simplify right side
    20,885.10x = 435,755,086.56
  5. Step 5: Solve for x
    x = 435,755,086.56/20,885.10
  6. Step 6: Final answer
    x = 20,864.40

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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.