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Finding the Fourth Proportional to 2,689.85, 4,034.81 and 840.83

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Solution

The fourth proportional to 2,689.85, 4,034.81 and 840.83 is: 1,261.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,689.85 : 4,034.81 = 840.83 : x
  2. Step 2: Convert to fraction form
    2,689.85/4,034.81 = 840.83/x
  3. Step 3: Cross multiply
    2,689.85x = 4,034.81 × 840.83
  4. Step 4: Simplify right side
    2,689.85x = 3,392,585.09
  5. Step 5: Solve for x
    x = 3,392,585.09/2,689.85
  6. Step 6: Final answer
    x = 1,261.25

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1.5x scale

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.