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Finding the Fourth Proportional to 1,781.21, 2,671.05 and 611.33

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Solution

The fourth proportional to 1,781.21, 2,671.05 and 611.33 is: 916.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.21 : 2,671.05 = 611.33 : x
  2. Step 2: Convert to fraction form
    1,781.21/2,671.05 = 611.33/x
  3. Step 3: Cross multiply
    1,781.21x = 2,671.05 × 611.33
  4. Step 4: Simplify right side
    1,781.21x = 1,632,881.93
  5. Step 5: Solve for x
    x = 1,632,881.93/1,781.21
  6. Step 6: Final answer
    x = 916.72

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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.