Home / 20,405.76-28,132.87-13,319.88

Finding the Fourth Proportional to 20,405.76, 28,132.87 and 13,319.88

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Solution

The fourth proportional to 20,405.76, 28,132.87 and 13,319.88 is: 18,363.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.76 : 28,132.87 = 13,319.88 : x
  2. Step 2: Convert to fraction form
    20,405.76/28,132.87 = 13,319.88/x
  3. Step 3: Cross multiply
    20,405.76x = 28,132.87 × 13,319.88
  4. Step 4: Simplify right side
    20,405.76x = 374,726,452.46
  5. Step 5: Solve for x
    x = 374,726,452.46/20,405.76
  6. Step 6: Final answer
    x = 18,363.76

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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.