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Finding the Fourth Proportional to 1,781.36, 2,672.25 and 742.06

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Solution

The fourth proportional to 1,781.36, 2,672.25 and 742.06 is: 1,113.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.36 : 2,672.25 = 742.06 : x
  2. Step 2: Convert to fraction form
    1,781.36/2,672.25 = 742.06/x
  3. Step 3: Cross multiply
    1,781.36x = 2,672.25 × 742.06
  4. Step 4: Simplify right side
    1,781.36x = 1,982,974.57
  5. Step 5: Solve for x
    x = 1,982,974.57/1,781.36
  6. Step 6: Final answer
    x = 1,113.18

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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.