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Finding the Fourth Proportional to 1,974.12, 2,956.11 and 1,915.71

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Solution

The fourth proportional to 1,974.12, 2,956.11 and 1,915.71 is: 2,868.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,974.12 : 2,956.11 = 1,915.71 : x
  2. Step 2: Convert to fraction form
    1,974.12/2,956.11 = 1,915.71/x
  3. Step 3: Cross multiply
    1,974.12x = 2,956.11 × 1,915.71
  4. Step 4: Simplify right side
    1,974.12x = 5,663,049.49
  5. Step 5: Solve for x
    x = 5,663,049.49/1,974.12
  6. Step 6: Final answer
    x = 2,868.65

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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.