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Finding the Fourth Proportional to 2,689.68, 4,034.76 and 840.48

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Solution

The fourth proportional to 2,689.68, 4,034.76 and 840.48 is: 1,260.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.68 : 4,034.76 = 840.48 : x
  2. Step 2: Convert to fraction form
    2,689.68/4,034.76 = 840.48/x
  3. Step 3: Cross multiply
    2,689.68x = 4,034.76 × 840.48
  4. Step 4: Simplify right side
    2,689.68x = 3,391,135.08
  5. Step 5: Solve for x
    x = 3,391,135.08/2,689.68
  6. Step 6: Final answer
    x = 1,260.79

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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.