Home / 13,781.40-20,672.10-9,115.80

Finding the Fourth Proportional to 13,781.40, 20,672.10 and 9,115.80

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Solution

The fourth proportional to 13,781.40, 20,672.10 and 9,115.80 is: 13,673.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.40 : 20,672.10 = 9,115.80 : x
  2. Step 2: Convert to fraction form
    13,781.40/20,672.10 = 9,115.80/x
  3. Step 3: Cross multiply
    13,781.40x = 20,672.10 × 9,115.80
  4. Step 4: Simplify right side
    13,781.40x = 188,442,729.18
  5. Step 5: Solve for x
    x = 188,442,729.18/13,781.40
  6. Step 6: Final answer
    x = 13,673.70

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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.