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Finding the Fourth Proportional to 638.87, 881.65 and 359.12

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Solution

The fourth proportional to 638.87, 881.65 and 359.12 is: 495.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.87 : 881.65 = 359.12 : x
  2. Step 2: Convert to fraction form
    638.87/881.65 = 359.12/x
  3. Step 3: Cross multiply
    638.87x = 881.65 × 359.12
  4. Step 4: Simplify right side
    638.87x = 316,614.15
  5. Step 5: Solve for x
    x = 316,614.15/638.87
  6. Step 6: Final answer
    x = 495.58

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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.