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Finding the Fourth Proportional to 218,926.80, 328,390.20 and 78,699.60

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Solution

The fourth proportional to 218,926.80, 328,390.20 and 78,699.60 is: 118,049.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,926.80 : 328,390.20 = 78,699.60 : x
  2. Step 2: Convert to fraction form
    218,926.80/328,390.20 = 78,699.60/x
  3. Step 3: Cross multiply
    218,926.80x = 328,390.20 × 78,699.60
  4. Step 4: Simplify right side
    218,926.80x = 25,844,177,383.92
  5. Step 5: Solve for x
    x = 25,844,177,383.92/218,926.80
  6. Step 6: Final answer
    x = 118,049.40

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1.5x scale

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.