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Finding the Fourth Proportional to 636.48, 954.72 and 428.31

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Solution

The fourth proportional to 636.48, 954.72 and 428.31 is: 642.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.48 : 954.72 = 428.31 : x
  2. Step 2: Convert to fraction form
    636.48/954.72 = 428.31/x
  3. Step 3: Cross multiply
    636.48x = 954.72 × 428.31
  4. Step 4: Simplify right side
    636.48x = 408,916.12
  5. Step 5: Solve for x
    x = 408,916.12/636.48
  6. Step 6: Final answer
    x = 642.47

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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.