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Finding the Fourth Proportional to 1,206.62, 1,809.92 and 659.87

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Solution

The fourth proportional to 1,206.62, 1,809.92 and 659.87 is: 989.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.62 : 1,809.92 = 659.87 : x
  2. Step 2: Convert to fraction form
    1,206.62/1,809.92 = 659.87/x
  3. Step 3: Cross multiply
    1,206.62x = 1,809.92 × 659.87
  4. Step 4: Simplify right side
    1,206.62x = 1,194,299.56
  5. Step 5: Solve for x
    x = 1,194,299.56/1,206.62
  6. Step 6: Final answer
    x = 989.79

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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.