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Finding the Fourth Proportional to 1,981.32, 2,972.25 and 682.89

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Solution

The fourth proportional to 1,981.32, 2,972.25 and 682.89 is: 1,024.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.32 : 2,972.25 = 682.89 : x
  2. Step 2: Convert to fraction form
    1,981.32/2,972.25 = 682.89/x
  3. Step 3: Cross multiply
    1,981.32x = 2,972.25 × 682.89
  4. Step 4: Simplify right side
    1,981.32x = 2,029,719.80
  5. Step 5: Solve for x
    x = 2,029,719.80/1,981.32
  6. Step 6: Final answer
    x = 1,024.43

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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.