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Finding the Fourth Proportional to 1,781.15, 2,671.44 and 611.11

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Solution

The fourth proportional to 1,781.15, 2,671.44 and 611.11 is: 916.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.15 : 2,671.44 = 611.11 : x
  2. Step 2: Convert to fraction form
    1,781.15/2,671.44 = 611.11/x
  3. Step 3: Cross multiply
    1,781.15x = 2,671.44 × 611.11
  4. Step 4: Simplify right side
    1,781.15x = 1,632,530.34
  5. Step 5: Solve for x
    x = 1,632,530.34/1,781.15
  6. Step 6: Final answer
    x = 916.56

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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.