Home / 20,781.18-28,672.65-13,224.42

Finding the Fourth Proportional to 20,781.18, 28,672.65 and 13,224.42

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Solution

The fourth proportional to 20,781.18, 28,672.65 and 13,224.42 is: 18,246.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.18 : 28,672.65 = 13,224.42 : x
  2. Step 2: Convert to fraction form
    20,781.18/28,672.65 = 13,224.42/x
  3. Step 3: Cross multiply
    20,781.18x = 28,672.65 × 13,224.42
  4. Step 4: Simplify right side
    20,781.18x = 379,179,166.11
  5. Step 5: Solve for x
    x = 379,179,166.11/20,781.18
  6. Step 6: Final answer
    x = 18,246.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.