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Finding the Fourth Proportional to 1,988.34, 2,982.81 and 689.50

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Solution

The fourth proportional to 1,988.34, 2,982.81 and 689.50 is: 1,034.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.34 : 2,982.81 = 689.50 : x
  2. Step 2: Convert to fraction form
    1,988.34/2,982.81 = 689.50/x
  3. Step 3: Cross multiply
    1,988.34x = 2,982.81 × 689.50
  4. Step 4: Simplify right side
    1,988.34x = 2,056,647.50
  5. Step 5: Solve for x
    x = 2,056,647.50/1,988.34
  6. Step 6: Final answer
    x = 1,034.35

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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.