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Finding the Fourth Proportional to 218,221.20, 327,088.80 and 85,057.20

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Solution

The fourth proportional to 218,221.20, 327,088.80 and 85,057.20 is: 127,491.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,221.20 : 327,088.80 = 85,057.20 : x
  2. Step 2: Convert to fraction form
    218,221.20/327,088.80 = 85,057.20/x
  3. Step 3: Cross multiply
    218,221.20x = 327,088.80 × 85,057.20
  4. Step 4: Simplify right side
    218,221.20x = 27,821,257,479.36
  5. Step 5: Solve for x
    x = 27,821,257,479.36/218,221.20
  6. Step 6: Final answer
    x = 127,491.08

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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.