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Finding the Fourth Proportional to 638.37, 957.69 and 309.54

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Solution

The fourth proportional to 638.37, 957.69 and 309.54 is: 464.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.37 : 957.69 = 309.54 : x
  2. Step 2: Convert to fraction form
    638.37/957.69 = 309.54/x
  3. Step 3: Cross multiply
    638.37x = 957.69 × 309.54
  4. Step 4: Simplify right side
    638.37x = 296,446.95
  5. Step 5: Solve for x
    x = 296,446.95/638.37
  6. Step 6: Final answer
    x = 464.38

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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.