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Finding the Fourth Proportional to 78,831.80, 118,247.70 and 72,380.60

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Solution

The fourth proportional to 78,831.80, 118,247.70 and 72,380.60 is: 108,570.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,831.80 : 118,247.70 = 72,380.60 : x
  2. Step 2: Convert to fraction form
    78,831.80/118,247.70 = 72,380.60/x
  3. Step 3: Cross multiply
    78,831.80x = 118,247.70 × 72,380.60
  4. Step 4: Simplify right side
    78,831.80x = 8,558,839,474.62
  5. Step 5: Solve for x
    x = 8,558,839,474.62/78,831.80
  6. Step 6: Final answer
    x = 108,570.90

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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.