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Finding the Fourth Proportional to 1,781.25, 2,671.86 and 686.39

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Solution

The fourth proportional to 1,781.25, 2,671.86 and 686.39 is: 1,029.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.25 : 2,671.86 = 686.39 : x
  2. Step 2: Convert to fraction form
    1,781.25/2,671.86 = 686.39/x
  3. Step 3: Cross multiply
    1,781.25x = 2,671.86 × 686.39
  4. Step 4: Simplify right side
    1,781.25x = 1,833,924.63
  5. Step 5: Solve for x
    x = 1,833,924.63/1,781.25
  6. Step 6: Final answer
    x = 1,029.57

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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.