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Finding the Fourth Proportional to 1,781.50, 2,672.29 and 741.21

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Solution

The fourth proportional to 1,781.50, 2,672.29 and 741.21 is: 1,111.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.50 : 2,672.29 = 741.21 : x
  2. Step 2: Convert to fraction form
    1,781.50/2,672.29 = 741.21/x
  3. Step 3: Cross multiply
    1,781.50x = 2,672.29 × 741.21
  4. Step 4: Simplify right side
    1,781.50x = 1,980,728.07
  5. Step 5: Solve for x
    x = 1,980,728.07/1,781.50
  6. Step 6: Final answer
    x = 1,111.83

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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.