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Finding the Fourth Proportional to 218,987.38, 328,481.07 and 85,930.30

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Solution

The fourth proportional to 218,987.38, 328,481.07 and 85,930.30 is: 128,895.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,987.38 : 328,481.07 = 85,930.30 : x
  2. Step 2: Convert to fraction form
    218,987.38/328,481.07 = 85,930.30/x
  3. Step 3: Cross multiply
    218,987.38x = 328,481.07 × 85,930.30
  4. Step 4: Simplify right side
    218,987.38x = 28,226,476,889.42
  5. Step 5: Solve for x
    x = 28,226,476,889.42/218,987.38
  6. Step 6: Final answer
    x = 128,895.45

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Similar ratio
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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.