Home / 20,565.20-30,862.20-13,187.60

Finding the Fourth Proportional to 20,565.20, 30,862.20 and 13,187.60

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Solution

The fourth proportional to 20,565.20, 30,862.20 and 13,187.60 is: 19,790.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,565.20 : 30,862.20 = 13,187.60 : x
  2. Step 2: Convert to fraction form
    20,565.20/30,862.20 = 13,187.60/x
  3. Step 3: Cross multiply
    20,565.20x = 30,862.20 × 13,187.60
  4. Step 4: Simplify right side
    20,565.20x = 406,998,348.72
  5. Step 5: Solve for x
    x = 406,998,348.72/20,565.20
  6. Step 6: Final answer
    x = 19,790.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.