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Finding the Fourth Proportional to 426.49, 640.80 and 272.49

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Solution

The fourth proportional to 426.49, 640.80 and 272.49 is: 409.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.49 : 640.80 = 272.49 : x
  2. Step 2: Convert to fraction form
    426.49/640.80 = 272.49/x
  3. Step 3: Cross multiply
    426.49x = 640.80 × 272.49
  4. Step 4: Simplify right side
    426.49x = 174,611.59
  5. Step 5: Solve for x
    x = 174,611.59/426.49
  6. Step 6: Final answer
    x = 409.42

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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.