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Finding the Fourth Proportional to 2,589.76, 3,885.04 and 858.78

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Solution

The fourth proportional to 2,589.76, 3,885.04 and 858.78 is: 1,288.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,589.76 : 3,885.04 = 858.78 : x
  2. Step 2: Convert to fraction form
    2,589.76/3,885.04 = 858.78/x
  3. Step 3: Cross multiply
    2,589.76x = 3,885.04 × 858.78
  4. Step 4: Simplify right side
    2,589.76x = 3,336,394.65
  5. Step 5: Solve for x
    x = 3,336,394.65/2,589.76
  6. Step 6: Final answer
    x = 1,288.30

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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.