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Finding the Fourth Proportional to 1,781.53, 2,672.80 and 611.69

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Solution

The fourth proportional to 1,781.53, 2,672.80 and 611.69 is: 917.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.53 : 2,672.80 = 611.69 : x
  2. Step 2: Convert to fraction form
    1,781.53/2,672.80 = 611.69/x
  3. Step 3: Cross multiply
    1,781.53x = 2,672.80 × 611.69
  4. Step 4: Simplify right side
    1,781.53x = 1,634,910.14
  5. Step 5: Solve for x
    x = 1,634,910.14/1,781.53
  6. Step 6: Final answer
    x = 917.70

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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.