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Finding the Fourth Proportional to 427.01, 639.38 and 272.10

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Solution

The fourth proportional to 427.01, 639.38 and 272.10 is: 407.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.01 : 639.38 = 272.10 : x
  2. Step 2: Convert to fraction form
    427.01/639.38 = 272.10/x
  3. Step 3: Cross multiply
    427.01x = 639.38 × 272.10
  4. Step 4: Simplify right side
    427.01x = 173,974.96
  5. Step 5: Solve for x
    x = 173,974.96/427.01
  6. Step 6: Final answer
    x = 407.42

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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.