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Finding the Fourth Proportional to 218,781.20, 328,244.60 and 78,550.80

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Solution

The fourth proportional to 218,781.20, 328,244.60 and 78,550.80 is: 117,852.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,781.20 : 328,244.60 = 78,550.80 : x
  2. Step 2: Convert to fraction form
    218,781.20/328,244.60 = 78,550.80/x
  3. Step 3: Cross multiply
    218,781.20x = 328,244.60 × 78,550.80
  4. Step 4: Simplify right side
    218,781.20x = 25,783,875,925.68
  5. Step 5: Solve for x
    x = 25,783,875,925.68/218,781.20
  6. Step 6: Final answer
    x = 117,852.34

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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.