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Finding the Fourth Proportional to 638.97, 881.16 and 417.84

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Solution

The fourth proportional to 638.97, 881.16 and 417.84 is: 576.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.97 : 881.16 = 417.84 : x
  2. Step 2: Convert to fraction form
    638.97/881.16 = 417.84/x
  3. Step 3: Cross multiply
    638.97x = 881.16 × 417.84
  4. Step 4: Simplify right side
    638.97x = 368,183.89
  5. Step 5: Solve for x
    x = 368,183.89/638.97
  6. Step 6: Final answer
    x = 576.21

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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.