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Finding the Fourth Proportional to 80,680.80, 121,021.20 and 70,831.20

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Solution

The fourth proportional to 80,680.80, 121,021.20 and 70,831.20 is: 106,246.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,680.80 : 121,021.20 = 70,831.20 : x
  2. Step 2: Convert to fraction form
    80,680.80/121,021.20 = 70,831.20/x
  3. Step 3: Cross multiply
    80,680.80x = 121,021.20 × 70,831.20
  4. Step 4: Simplify right side
    80,680.80x = 8,572,076,821.44
  5. Step 5: Solve for x
    x = 8,572,076,821.44/80,680.80
  6. Step 6: Final answer
    x = 106,246.80

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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.