Home / 20,909.72-28,854.54-11,478.48

Finding the Fourth Proportional to 20,909.72, 28,854.54 and 11,478.48

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Solution

The fourth proportional to 20,909.72, 28,854.54 and 11,478.48 is: 15,839.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.72 : 28,854.54 = 11,478.48 : x
  2. Step 2: Convert to fraction form
    20,909.72/28,854.54 = 11,478.48/x
  3. Step 3: Cross multiply
    20,909.72x = 28,854.54 × 11,478.48
  4. Step 4: Simplify right side
    20,909.72x = 331,206,260.30
  5. Step 5: Solve for x
    x = 331,206,260.30/20,909.72
  6. Step 6: Final answer
    x = 15,839.83

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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.