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Finding the Fourth Proportional to 1,216.50, 1,679.10 and 797.91

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Solution

The fourth proportional to 1,216.50, 1,679.10 and 797.91 is: 1,101.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.50 : 1,679.10 = 797.91 : x
  2. Step 2: Convert to fraction form
    1,216.50/1,679.10 = 797.91/x
  3. Step 3: Cross multiply
    1,216.50x = 1,679.10 × 797.91
  4. Step 4: Simplify right side
    1,216.50x = 1,339,770.68
  5. Step 5: Solve for x
    x = 1,339,770.68/1,216.50
  6. Step 6: Final answer
    x = 1,101.33

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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.