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Finding the Fourth Proportional to 798.68, 1,102.20 and 449.36

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Solution

The fourth proportional to 798.68, 1,102.20 and 449.36 is: 620.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.68 : 1,102.20 = 449.36 : x
  2. Step 2: Convert to fraction form
    798.68/1,102.20 = 449.36/x
  3. Step 3: Cross multiply
    798.68x = 1,102.20 × 449.36
  4. Step 4: Simplify right side
    798.68x = 495,284.59
  5. Step 5: Solve for x
    x = 495,284.59/798.68
  6. Step 6: Final answer
    x = 620.13

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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.