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Finding the Fourth Proportional to 638.40, 880.52 and 472.62

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Solution

The fourth proportional to 638.40, 880.52 and 472.62 is: 651.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.40 : 880.52 = 472.62 : x
  2. Step 2: Convert to fraction form
    638.40/880.52 = 472.62/x
  3. Step 3: Cross multiply
    638.40x = 880.52 × 472.62
  4. Step 4: Simplify right side
    638.40x = 416,151.36
  5. Step 5: Solve for x
    x = 416,151.36/638.40
  6. Step 6: Final answer
    x = 651.87

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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.