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Finding the Fourth Proportional to 1,781.70, 2,673.39 and 686.46

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Solution

The fourth proportional to 1,781.70, 2,673.39 and 686.46 is: 1,030.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.70 : 2,673.39 = 686.46 : x
  2. Step 2: Convert to fraction form
    1,781.70/2,673.39 = 686.46/x
  3. Step 3: Cross multiply
    1,781.70x = 2,673.39 × 686.46
  4. Step 4: Simplify right side
    1,781.70x = 1,835,175.30
  5. Step 5: Solve for x
    x = 1,835,175.30/1,781.70
  6. Step 6: Final answer
    x = 1,030.01

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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.