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Finding the Fourth Proportional to 1,988.50, 2,982.61 and 818.20

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Solution

The fourth proportional to 1,988.50, 2,982.61 and 818.20 is: 1,227.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.50 : 2,982.61 = 818.20 : x
  2. Step 2: Convert to fraction form
    1,988.50/2,982.61 = 818.20/x
  3. Step 3: Cross multiply
    1,988.50x = 2,982.61 × 818.20
  4. Step 4: Simplify right side
    1,988.50x = 2,440,371.50
  5. Step 5: Solve for x
    x = 2,440,371.50/1,988.50
  6. Step 6: Final answer
    x = 1,227.24

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1.5x scale

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.