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Finding the Fourth Proportional to 1,660.61, 2,291.15 and 997.22

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Solution

The fourth proportional to 1,660.61, 2,291.15 and 997.22 is: 1,375.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.61 : 2,291.15 = 997.22 : x
  2. Step 2: Convert to fraction form
    1,660.61/2,291.15 = 997.22/x
  3. Step 3: Cross multiply
    1,660.61x = 2,291.15 × 997.22
  4. Step 4: Simplify right side
    1,660.61x = 2,284,788.82
  5. Step 5: Solve for x
    x = 2,284,788.82/1,660.61
  6. Step 6: Final answer
    x = 1,375.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.