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Finding the Fourth Proportional to 401.30, 552.55 and 331.13

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Solution

The fourth proportional to 401.30, 552.55 and 331.13 is: 455.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.30 : 552.55 = 331.13 : x
  2. Step 2: Convert to fraction form
    401.30/552.55 = 331.13/x
  3. Step 3: Cross multiply
    401.30x = 552.55 × 331.13
  4. Step 4: Simplify right side
    401.30x = 182,965.88
  5. Step 5: Solve for x
    x = 182,965.88/401.30
  6. Step 6: Final answer
    x = 455.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.