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Finding the Fourth Proportional to 427.49, 640.65 and 196.10

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Solution

The fourth proportional to 427.49, 640.65 and 196.10 is: 293.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.49 : 640.65 = 196.10 : x
  2. Step 2: Convert to fraction form
    427.49/640.65 = 196.10/x
  3. Step 3: Cross multiply
    427.49x = 640.65 × 196.10
  4. Step 4: Simplify right side
    427.49x = 125,631.47
  5. Step 5: Solve for x
    x = 125,631.47/427.49
  6. Step 6: Final answer
    x = 293.88

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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.