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Finding the Fourth Proportional to 206,998.20, 310,497.30 and 136,139.40

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Solution

The fourth proportional to 206,998.20, 310,497.30 and 136,139.40 is: 204,209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,998.20 : 310,497.30 = 136,139.40 : x
  2. Step 2: Convert to fraction form
    206,998.20/310,497.30 = 136,139.40/x
  3. Step 3: Cross multiply
    206,998.20x = 310,497.30 × 136,139.40
  4. Step 4: Simplify right side
    206,998.20x = 42,270,916,123.62
  5. Step 5: Solve for x
    x = 42,270,916,123.62/206,998.20
  6. Step 6: Final answer
    x = 204,209.10

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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.