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Finding the Fourth Proportional to 206,780.20, 310,224.30 and 66,542.20

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Solution

The fourth proportional to 206,780.20, 310,224.30 and 66,542.20 is: 99,830.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,780.20 : 310,224.30 = 66,542.20 : x
  2. Step 2: Convert to fraction form
    206,780.20/310,224.30 = 66,542.20/x
  3. Step 3: Cross multiply
    206,780.20x = 310,224.30 × 66,542.20
  4. Step 4: Simplify right side
    206,780.20x = 20,643,007,415.46
  5. Step 5: Solve for x
    x = 20,643,007,415.46/206,780.20
  6. Step 6: Final answer
    x = 99,830.68

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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.