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Finding the Fourth Proportional to 638.99, 958.58 and 206.24

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Solution

The fourth proportional to 638.99, 958.58 and 206.24 is: 309.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.99 : 958.58 = 206.24 : x
  2. Step 2: Convert to fraction form
    638.99/958.58 = 206.24/x
  3. Step 3: Cross multiply
    638.99x = 958.58 × 206.24
  4. Step 4: Simplify right side
    638.99x = 197,697.54
  5. Step 5: Solve for x
    x = 197,697.54/638.99
  6. Step 6: Final answer
    x = 309.39

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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.