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Finding the Fourth Proportional to 2,691.12, 4,036.72 and 959.76

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Solution

The fourth proportional to 2,691.12, 4,036.72 and 959.76 is: 1,439.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,691.12 : 4,036.72 = 959.76 : x
  2. Step 2: Convert to fraction form
    2,691.12/4,036.72 = 959.76/x
  3. Step 3: Cross multiply
    2,691.12x = 4,036.72 × 959.76
  4. Step 4: Simplify right side
    2,691.12x = 3,874,282.39
  5. Step 5: Solve for x
    x = 3,874,282.39/2,691.12
  6. Step 6: Final answer
    x = 1,439.65

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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.