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Finding the Fourth Proportional to 636.40, 952.24 and 388.72

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Solution

The fourth proportional to 636.40, 952.24 and 388.72 is: 581.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.40 : 952.24 = 388.72 : x
  2. Step 2: Convert to fraction form
    636.40/952.24 = 388.72/x
  3. Step 3: Cross multiply
    636.40x = 952.24 × 388.72
  4. Step 4: Simplify right side
    636.40x = 370,154.73
  5. Step 5: Solve for x
    x = 370,154.73/636.40
  6. Step 6: Final answer
    x = 581.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.