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Finding the Fourth Proportional to 401.88, 554.40 and 331.68

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Solution

The fourth proportional to 401.88, 554.40 and 331.68 is: 457.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.88 : 554.40 = 331.68 : x
  2. Step 2: Convert to fraction form
    401.88/554.40 = 331.68/x
  3. Step 3: Cross multiply
    401.88x = 554.40 × 331.68
  4. Step 4: Simplify right side
    401.88x = 183,883.39
  5. Step 5: Solve for x
    x = 183,883.39/401.88
  6. Step 6: Final answer
    x = 457.56

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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.