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Finding the Fourth Proportional to 218,847.09, 328,139.19 and 85,568.58

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Solution

The fourth proportional to 218,847.09, 328,139.19 and 85,568.58 is: 128,301.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,847.09 : 328,139.19 = 85,568.58 : x
  2. Step 2: Convert to fraction form
    218,847.09/328,139.19 = 85,568.58/x
  3. Step 3: Cross multiply
    218,847.09x = 328,139.19 × 85,568.58
  4. Step 4: Simplify right side
    218,847.09x = 28,078,404,530.65
  5. Step 5: Solve for x
    x = 28,078,404,530.65/218,847.09
  6. Step 6: Final answer
    x = 128,301.48

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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.