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Finding the Fourth Proportional to 2,609.30, 3,913.96 and 878.06

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Solution

The fourth proportional to 2,609.30, 3,913.96 and 878.06 is: 1,317.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,609.30 : 3,913.96 = 878.06 : x
  2. Step 2: Convert to fraction form
    2,609.30/3,913.96 = 878.06/x
  3. Step 3: Cross multiply
    2,609.30x = 3,913.96 × 878.06
  4. Step 4: Simplify right side
    2,609.30x = 3,436,691.72
  5. Step 5: Solve for x
    x = 3,436,691.72/2,609.30
  6. Step 6: Final answer
    x = 1,317.09

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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.