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Finding the Fourth Proportional to 2,605.66, 3,908.85 and 874.78

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Solution

The fourth proportional to 2,605.66, 3,908.85 and 874.78 is: 1,312.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,605.66 : 3,908.85 = 874.78 : x
  2. Step 2: Convert to fraction form
    2,605.66/3,908.85 = 874.78/x
  3. Step 3: Cross multiply
    2,605.66x = 3,908.85 × 874.78
  4. Step 4: Simplify right side
    2,605.66x = 3,419,383.80
  5. Step 5: Solve for x
    x = 3,419,383.80/2,605.66
  6. Step 6: Final answer
    x = 1,312.29

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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.