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Finding the Fourth Proportional to 206,428.80, 309,700.80 and 101,251.20

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Solution

The fourth proportional to 206,428.80, 309,700.80 and 101,251.20 is: 151,905.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,428.80 : 309,700.80 = 101,251.20 : x
  2. Step 2: Convert to fraction form
    206,428.80/309,700.80 = 101,251.20/x
  3. Step 3: Cross multiply
    206,428.80x = 309,700.80 × 101,251.20
  4. Step 4: Simplify right side
    206,428.80x = 31,357,577,640.96
  5. Step 5: Solve for x
    x = 31,357,577,640.96/206,428.80
  6. Step 6: Final answer
    x = 151,905.05

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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.