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Finding the Fourth Proportional to 1,781.66, 2,673.51 and 686.09

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Solution

The fourth proportional to 1,781.66, 2,673.51 and 686.09 is: 1,029.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.66 : 2,673.51 = 686.09 : x
  2. Step 2: Convert to fraction form
    1,781.66/2,673.51 = 686.09/x
  3. Step 3: Cross multiply
    1,781.66x = 2,673.51 × 686.09
  4. Step 4: Simplify right side
    1,781.66x = 1,834,257.55
  5. Step 5: Solve for x
    x = 1,834,257.55/1,781.66
  6. Step 6: Final answer
    x = 1,029.52

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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.