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Finding the Fourth Proportional to 330.90, 457.29 and 248.28

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Solution

The fourth proportional to 330.90, 457.29 and 248.28 is: 343.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.90 : 457.29 = 248.28 : x
  2. Step 2: Convert to fraction form
    330.90/457.29 = 248.28/x
  3. Step 3: Cross multiply
    330.90x = 457.29 × 248.28
  4. Step 4: Simplify right side
    330.90x = 113,535.96
  5. Step 5: Solve for x
    x = 113,535.96/330.90
  6. Step 6: Final answer
    x = 343.11

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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.