Home / 20,951.19-28,909.31-13,404.15

Finding the Fourth Proportional to 20,951.19, 28,909.31 and 13,404.15

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Solution

The fourth proportional to 20,951.19, 28,909.31 and 13,404.15 is: 18,495.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.19 : 28,909.31 = 13,404.15 : x
  2. Step 2: Convert to fraction form
    20,951.19/28,909.31 = 13,404.15/x
  3. Step 3: Cross multiply
    20,951.19x = 28,909.31 × 13,404.15
  4. Step 4: Simplify right side
    20,951.19x = 387,504,660.62
  5. Step 5: Solve for x
    x = 387,504,660.62/20,951.19
  6. Step 6: Final answer
    x = 18,495.59

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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.