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Finding the Fourth Proportional to 1,988.31, 2,982.75 and 689.88

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Solution

The fourth proportional to 1,988.31, 2,982.75 and 689.88 is: 1,034.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.31 : 2,982.75 = 689.88 : x
  2. Step 2: Convert to fraction form
    1,988.31/2,982.75 = 689.88/x
  3. Step 3: Cross multiply
    1,988.31x = 2,982.75 × 689.88
  4. Step 4: Simplify right side
    1,988.31x = 2,057,739.57
  5. Step 5: Solve for x
    x = 2,057,739.57/1,988.31
  6. Step 6: Final answer
    x = 1,034.92

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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.