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Finding the Fourth Proportional to 638.95, 881.79 and 369.85

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Solution

The fourth proportional to 638.95, 881.79 and 369.85 is: 510.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.95 : 881.79 = 369.85 : x
  2. Step 2: Convert to fraction form
    638.95/881.79 = 369.85/x
  3. Step 3: Cross multiply
    638.95x = 881.79 × 369.85
  4. Step 4: Simplify right side
    638.95x = 326,125.62
  5. Step 5: Solve for x
    x = 326,125.62/638.95
  6. Step 6: Final answer
    x = 510.41

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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.