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Finding the Fourth Proportional to 427, 640.58 and 199

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Solution

The fourth proportional to 427, 640.58 and 199 is: 298.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    427 : 640.58 = 199 : x
  2. Step 2: Convert to fraction form
    427/640.58 = 199/x
  3. Step 3: Cross multiply
    427x = 640.58 × 199
  4. Step 4: Simplify right side
    427x = 127,475.42
  5. Step 5: Solve for x
    x = 127,475.42/427
  6. Step 6: Final answer
    x = 298.54

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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.