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Finding the Fourth Proportional to 1,660.91, 2,491.37 and 685.94

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Solution

The fourth proportional to 1,660.91, 2,491.37 and 685.94 is: 1,028.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.91 : 2,491.37 = 685.94 : x
  2. Step 2: Convert to fraction form
    1,660.91/2,491.37 = 685.94/x
  3. Step 3: Cross multiply
    1,660.91x = 2,491.37 × 685.94
  4. Step 4: Simplify right side
    1,660.91x = 1,708,926.91
  5. Step 5: Solve for x
    x = 1,708,926.91/1,660.91
  6. Step 6: Final answer
    x = 1,028.91

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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.