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Finding the Fourth Proportional to 1,781.65, 2,672.51 and 611.65

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Solution

The fourth proportional to 1,781.65, 2,672.51 and 611.65 is: 917.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.65 : 2,672.51 = 611.65 : x
  2. Step 2: Convert to fraction form
    1,781.65/2,672.51 = 611.65/x
  3. Step 3: Cross multiply
    1,781.65x = 2,672.51 × 611.65
  4. Step 4: Simplify right side
    1,781.65x = 1,634,635.59
  5. Step 5: Solve for x
    x = 1,634,635.59/1,781.65
  6. Step 6: Final answer
    x = 917.48

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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.