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Finding the Fourth Proportional to 1,781.96, 2,673.36 and 686.48

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Solution

The fourth proportional to 1,781.96, 2,673.36 and 686.48 is: 1,029.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.96 : 2,673.36 = 686.48 : x
  2. Step 2: Convert to fraction form
    1,781.96/2,673.36 = 686.48/x
  3. Step 3: Cross multiply
    1,781.96x = 2,673.36 × 686.48
  4. Step 4: Simplify right side
    1,781.96x = 1,835,208.17
  5. Step 5: Solve for x
    x = 1,835,208.17/1,781.96
  6. Step 6: Final answer
    x = 1,029.88

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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.