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Finding the Fourth Proportional to 1,207.21, 1,810.82 and 659.85

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Solution

The fourth proportional to 1,207.21, 1,810.82 and 659.85 is: 989.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.21 : 1,810.82 = 659.85 : x
  2. Step 2: Convert to fraction form
    1,207.21/1,810.82 = 659.85/x
  3. Step 3: Cross multiply
    1,207.21x = 1,810.82 × 659.85
  4. Step 4: Simplify right side
    1,207.21x = 1,194,871.23
  5. Step 5: Solve for x
    x = 1,194,871.23/1,207.21
  6. Step 6: Final answer
    x = 989.78

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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.