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Finding the Fourth Proportional to 1,988.53, 2,982.78 and 819.10

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Solution

The fourth proportional to 1,988.53, 2,982.78 and 819.10 is: 1,228.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.53 : 2,982.78 = 819.10 : x
  2. Step 2: Convert to fraction form
    1,988.53/2,982.78 = 819.10/x
  3. Step 3: Cross multiply
    1,988.53x = 2,982.78 × 819.10
  4. Step 4: Simplify right side
    1,988.53x = 2,443,195.10
  5. Step 5: Solve for x
    x = 2,443,195.10/1,988.53
  6. Step 6: Final answer
    x = 1,228.64

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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.