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Finding the Fourth Proportional to 1,217.00, 1,678.34 and 797.21

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Solution

The fourth proportional to 1,217.00, 1,678.34 and 797.21 is: 1,099.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,217.00 : 1,678.34 = 797.21 : x
  2. Step 2: Convert to fraction form
    1,217.00/1,678.34 = 797.21/x
  3. Step 3: Cross multiply
    1,217.00x = 1,678.34 × 797.21
  4. Step 4: Simplify right side
    1,217.00x = 1,337,977.05
  5. Step 5: Solve for x
    x = 1,337,977.05/1,217.00
  6. Step 6: Final answer
    x = 1,099.41

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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.