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Finding the Fourth Proportional to 1,982.70, 2,972.70 and 943.20

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Solution

The fourth proportional to 1,982.70, 2,972.70 and 943.20 is: 1,414.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,982.70 : 2,972.70 = 943.20 : x
  2. Step 2: Convert to fraction form
    1,982.70/2,972.70 = 943.20/x
  3. Step 3: Cross multiply
    1,982.70x = 2,972.70 × 943.20
  4. Step 4: Simplify right side
    1,982.70x = 2,803,850.64
  5. Step 5: Solve for x
    x = 2,803,850.64/1,982.70
  6. Step 6: Final answer
    x = 1,414.16

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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.