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Finding the Fourth Proportional to 1,781.84, 2,671.92 and 686.18

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Solution

The fourth proportional to 1,781.84, 2,671.92 and 686.18 is: 1,028.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.84 : 2,671.92 = 686.18 : x
  2. Step 2: Convert to fraction form
    1,781.84/2,671.92 = 686.18/x
  3. Step 3: Cross multiply
    1,781.84x = 2,671.92 × 686.18
  4. Step 4: Simplify right side
    1,781.84x = 1,833,418.07
  5. Step 5: Solve for x
    x = 1,833,418.07/1,781.84
  6. Step 6: Final answer
    x = 1,028.95

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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.