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Finding the Fourth Proportional to 206,417.20, 309,625.80 and 127,685.20

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Solution

The fourth proportional to 206,417.20, 309,625.80 and 127,685.20 is: 191,527.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,417.20 : 309,625.80 = 127,685.20 : x
  2. Step 2: Convert to fraction form
    206,417.20/309,625.80 = 127,685.20/x
  3. Step 3: Cross multiply
    206,417.20x = 309,625.80 × 127,685.20
  4. Step 4: Simplify right side
    206,417.20x = 39,534,632,198.16
  5. Step 5: Solve for x
    x = 39,534,632,198.16/206,417.20
  6. Step 6: Final answer
    x = 191,527.80

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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.