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Finding the Fourth Proportional to 2,691.85, 3,714.70 and 1,643.91

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Solution

The fourth proportional to 2,691.85, 3,714.70 and 1,643.91 is: 2,268.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,691.85 : 3,714.70 = 1,643.91 : x
  2. Step 2: Convert to fraction form
    2,691.85/3,714.70 = 1,643.91/x
  3. Step 3: Cross multiply
    2,691.85x = 3,714.70 × 1,643.91
  4. Step 4: Simplify right side
    2,691.85x = 6,106,632.48
  5. Step 5: Solve for x
    x = 6,106,632.48/2,691.85
  6. Step 6: Final answer
    x = 2,268.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.