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Finding the Fourth Proportional to 20,565.20, 30,831.60 and 8,868.80

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Solution

The fourth proportional to 20,565.20, 30,831.60 and 8,868.80 is: 13,296.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,565.20 : 30,831.60 = 8,868.80 : x
  2. Step 2: Convert to fraction form
    20,565.20/30,831.60 = 8,868.80/x
  3. Step 3: Cross multiply
    20,565.20x = 30,831.60 × 8,868.80
  4. Step 4: Simplify right side
    20,565.20x = 273,439,294.08
  5. Step 5: Solve for x
    x = 273,439,294.08/20,565.20
  6. Step 6: Final answer
    x = 13,296.21

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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.