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Finding the Fourth Proportional to 798.78, 1,102.26 and 449.55

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Solution

The fourth proportional to 798.78, 1,102.26 and 449.55 is: 620.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.78 : 1,102.26 = 449.55 : x
  2. Step 2: Convert to fraction form
    798.78/1,102.26 = 449.55/x
  3. Step 3: Cross multiply
    798.78x = 1,102.26 × 449.55
  4. Step 4: Simplify right side
    798.78x = 495,520.98
  5. Step 5: Solve for x
    x = 495,520.98/798.78
  6. Step 6: Final answer
    x = 620.35

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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.