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Finding the Fourth Proportional to 427.55, 639.56 and 401.63

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Solution

The fourth proportional to 427.55, 639.56 and 401.63 is: 600.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.55 : 639.56 = 401.63 : x
  2. Step 2: Convert to fraction form
    427.55/639.56 = 401.63/x
  3. Step 3: Cross multiply
    427.55x = 639.56 × 401.63
  4. Step 4: Simplify right side
    427.55x = 256,864.29
  5. Step 5: Solve for x
    x = 256,864.29/427.55
  6. Step 6: Final answer
    x = 600.79

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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.