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Finding the Fourth Proportional to 218,769.20, 328,056.60 and 85,605.20

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Solution

The fourth proportional to 218,769.20, 328,056.60 and 85,605.20 is: 128,369.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,769.20 : 328,056.60 = 85,605.20 : x
  2. Step 2: Convert to fraction form
    218,769.20/328,056.60 = 85,605.20/x
  3. Step 3: Cross multiply
    218,769.20x = 328,056.60 × 85,605.20
  4. Step 4: Simplify right side
    218,769.20x = 28,083,350,854.32
  5. Step 5: Solve for x
    x = 28,083,350,854.32/218,769.20
  6. Step 6: Final answer
    x = 128,369.77

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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.