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Finding the Fourth Proportional to 1,786.60, 2,680.67 and 691.74

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Solution

The fourth proportional to 1,786.60, 2,680.67 and 691.74 is: 1,037.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.60 : 2,680.67 = 691.74 : x
  2. Step 2: Convert to fraction form
    1,786.60/2,680.67 = 691.74/x
  3. Step 3: Cross multiply
    1,786.60x = 2,680.67 × 691.74
  4. Step 4: Simplify right side
    1,786.60x = 1,854,326.67
  5. Step 5: Solve for x
    x = 1,854,326.67/1,786.60
  6. Step 6: Final answer
    x = 1,037.91

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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.