Home / 20,378.20-28,127.88-13,305.70

Finding the Fourth Proportional to 20,378.20, 28,127.88 and 13,305.70

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Solution

The fourth proportional to 20,378.20, 28,127.88 and 13,305.70 is: 18,365.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.20 : 28,127.88 = 13,305.70 : x
  2. Step 2: Convert to fraction form
    20,378.20/28,127.88 = 13,305.70/x
  3. Step 3: Cross multiply
    20,378.20x = 28,127.88 × 13,305.70
  4. Step 4: Simplify right side
    20,378.20x = 374,261,132.92
  5. Step 5: Solve for x
    x = 374,261,132.92/20,378.20
  6. Step 6: Final answer
    x = 18,365.76

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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.