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Finding the Fourth Proportional to 1,206.72, 1,808.97 and 426.15

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Solution

The fourth proportional to 1,206.72, 1,808.97 and 426.15 is: 638.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.72 : 1,808.97 = 426.15 : x
  2. Step 2: Convert to fraction form
    1,206.72/1,808.97 = 426.15/x
  3. Step 3: Cross multiply
    1,206.72x = 1,808.97 × 426.15
  4. Step 4: Simplify right side
    1,206.72x = 770,892.57
  5. Step 5: Solve for x
    x = 770,892.57/1,206.72
  6. Step 6: Final answer
    x = 638.83

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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.