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Finding the Fourth Proportional to 638.76, 950.48 and 636.60

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Solution

The fourth proportional to 638.76, 950.48 and 636.60 is: 947.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.76 : 950.48 = 636.60 : x
  2. Step 2: Convert to fraction form
    638.76/950.48 = 636.60/x
  3. Step 3: Cross multiply
    638.76x = 950.48 × 636.60
  4. Step 4: Simplify right side
    638.76x = 605,072.39
  5. Step 5: Solve for x
    x = 605,072.39/638.76
  6. Step 6: Final answer
    x = 947.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.