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Finding the Fourth Proportional to 1,216.83, 1,678.64 and 797

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Solution

The fourth proportional to 1,216.83, 1,678.64 and 797 is: 1,099.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.83 : 1,678.64 = 797 : x
  2. Step 2: Convert to fraction form
    1,216.83/1,678.64 = 797/x
  3. Step 3: Cross multiply
    1,216.83x = 1,678.64 × 797
  4. Step 4: Simplify right side
    1,216.83x = 1,337,876.08
  5. Step 5: Solve for x
    x = 1,337,876.08/1,216.83
  6. Step 6: Final answer
    x = 1,099.48

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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.