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Finding the Fourth Proportional to 426.48, 638.94 and 209.58

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Solution

The fourth proportional to 426.48, 638.94 and 209.58 is: 313.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.48 : 638.94 = 209.58 : x
  2. Step 2: Convert to fraction form
    426.48/638.94 = 209.58/x
  3. Step 3: Cross multiply
    426.48x = 638.94 × 209.58
  4. Step 4: Simplify right side
    426.48x = 133,909.05
  5. Step 5: Solve for x
    x = 133,909.05/426.48
  6. Step 6: Final answer
    x = 313.99

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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.