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Finding the Fourth Proportional to 218,793.98, 328,059.60 and 85,515.42

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Solution

The fourth proportional to 218,793.98, 328,059.60 and 85,515.42 is: 128,221.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,793.98 : 328,059.60 = 85,515.42 : x
  2. Step 2: Convert to fraction form
    218,793.98/328,059.60 = 85,515.42/x
  3. Step 3: Cross multiply
    218,793.98x = 328,059.60 × 85,515.42
  4. Step 4: Simplify right side
    218,793.98x = 28,054,154,479.03
  5. Step 5: Solve for x
    x = 28,054,154,479.03/218,793.98
  6. Step 6: Final answer
    x = 128,221.78

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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.