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Finding the Fourth Proportional to 2,391.66, 3,579.80 and 1,278.29

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Solution

The fourth proportional to 2,391.66, 3,579.80 and 1,278.29 is: 1,913.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,391.66 : 3,579.80 = 1,278.29 : x
  2. Step 2: Convert to fraction form
    2,391.66/3,579.80 = 1,278.29/x
  3. Step 3: Cross multiply
    2,391.66x = 3,579.80 × 1,278.29
  4. Step 4: Simplify right side
    2,391.66x = 4,576,022.54
  5. Step 5: Solve for x
    x = 4,576,022.54/2,391.66
  6. Step 6: Final answer
    x = 1,913.32

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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.