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Finding the Fourth Proportional to 206,209.80, 309,314.70 and 153,721.80

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Solution

The fourth proportional to 206,209.80, 309,314.70 and 153,721.80 is: 230,582.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,209.80 : 309,314.70 = 153,721.80 : x
  2. Step 2: Convert to fraction form
    206,209.80/309,314.70 = 153,721.80/x
  3. Step 3: Cross multiply
    206,209.80x = 309,314.70 × 153,721.80
  4. Step 4: Simplify right side
    206,209.80x = 47,548,412,450.46
  5. Step 5: Solve for x
    x = 47,548,412,450.46/206,209.80
  6. Step 6: Final answer
    x = 230,582.70

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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.