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Finding the Fourth Proportional to 80,781.72, 111,107.88 and 64,831.20

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Solution

The fourth proportional to 80,781.72, 111,107.88 and 64,831.20 is: 89,169.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,781.72 : 111,107.88 = 64,831.20 : x
  2. Step 2: Convert to fraction form
    80,781.72/111,107.88 = 64,831.20/x
  3. Step 3: Cross multiply
    80,781.72x = 111,107.88 × 64,831.20
  4. Step 4: Simplify right side
    80,781.72x = 7,203,257,189.86
  5. Step 5: Solve for x
    x = 7,203,257,189.86/80,781.72
  6. Step 6: Final answer
    x = 89,169.40

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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.