Home / 20,859.49-28,781.78-11,909.90

Finding the Fourth Proportional to 20,859.49, 28,781.78 and 11,909.90

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Solution

The fourth proportional to 20,859.49, 28,781.78 and 11,909.90 is: 16,433.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.49 : 28,781.78 = 11,909.90 : x
  2. Step 2: Convert to fraction form
    20,859.49/28,781.78 = 11,909.90/x
  3. Step 3: Cross multiply
    20,859.49x = 28,781.78 × 11,909.90
  4. Step 4: Simplify right side
    20,859.49x = 342,788,062.07
  5. Step 5: Solve for x
    x = 342,788,062.07/20,859.49
  6. Step 6: Final answer
    x = 16,433.20

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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.