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Finding the Fourth Proportional to 1,207.09, 1,809.22 and 659.73

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Solution

The fourth proportional to 1,207.09, 1,809.22 and 659.73 is: 988.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.09 : 1,809.22 = 659.73 : x
  2. Step 2: Convert to fraction form
    1,207.09/1,809.22 = 659.73/x
  3. Step 3: Cross multiply
    1,207.09x = 1,809.22 × 659.73
  4. Step 4: Simplify right side
    1,207.09x = 1,193,596.71
  5. Step 5: Solve for x
    x = 1,193,596.71/1,207.09
  6. Step 6: Final answer
    x = 988.82

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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.