Home / 20,380.38-28,129.59-12,001.74

Finding the Fourth Proportional to 20,380.38, 28,129.59 and 12,001.74

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Solution

The fourth proportional to 20,380.38, 28,129.59 and 12,001.74 is: 16,565.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.38 : 28,129.59 = 12,001.74 : x
  2. Step 2: Convert to fraction form
    20,380.38/28,129.59 = 12,001.74/x
  3. Step 3: Cross multiply
    20,380.38x = 28,129.59 × 12,001.74
  4. Step 4: Simplify right side
    20,380.38x = 337,604,025.49
  5. Step 5: Solve for x
    x = 337,604,025.49/20,380.38
  6. Step 6: Final answer
    x = 16,565.15

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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.