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Finding the Fourth Proportional to 638.75, 881.48 and 418.07

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Solution

The fourth proportional to 638.75, 881.48 and 418.07 is: 576.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.75 : 881.48 = 418.07 : x
  2. Step 2: Convert to fraction form
    638.75/881.48 = 418.07/x
  3. Step 3: Cross multiply
    638.75x = 881.48 × 418.07
  4. Step 4: Simplify right side
    638.75x = 368,520.34
  5. Step 5: Solve for x
    x = 368,520.34/638.75
  6. Step 6: Final answer
    x = 576.94

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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.