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Finding the Fourth Proportional to 1,988.19, 2,982.29 and 689.63

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Solution

The fourth proportional to 1,988.19, 2,982.29 and 689.63 is: 1,034.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.19 : 2,982.29 = 689.63 : x
  2. Step 2: Convert to fraction form
    1,988.19/2,982.29 = 689.63/x
  3. Step 3: Cross multiply
    1,988.19x = 2,982.29 × 689.63
  4. Step 4: Simplify right side
    1,988.19x = 2,056,658.29
  5. Step 5: Solve for x
    x = 2,056,658.29/1,988.19
  6. Step 6: Final answer
    x = 1,034.44

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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.