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Finding the Fourth Proportional to 206,561.60, 309,928.80 and 66,363.20

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Solution

The fourth proportional to 206,561.60, 309,928.80 and 66,363.20 is: 99,572.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,561.60 : 309,928.80 = 66,363.20 : x
  2. Step 2: Convert to fraction form
    206,561.60/309,928.80 = 66,363.20/x
  3. Step 3: Cross multiply
    206,561.60x = 309,928.80 × 66,363.20
  4. Step 4: Simplify right side
    206,561.60x = 20,567,866,940.16
  5. Step 5: Solve for x
    x = 20,567,866,940.16/206,561.60
  6. Step 6: Final answer
    x = 99,572.56

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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.