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Finding the Fourth Proportional to 426.53, 639.80 and 209.99

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Solution

The fourth proportional to 426.53, 639.80 and 209.99 is: 314.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.53 : 639.80 = 209.99 : x
  2. Step 2: Convert to fraction form
    426.53/639.80 = 209.99/x
  3. Step 3: Cross multiply
    426.53x = 639.80 × 209.99
  4. Step 4: Simplify right side
    426.53x = 134,351.60
  5. Step 5: Solve for x
    x = 134,351.60/426.53
  6. Step 6: Final answer
    x = 314.99

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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.