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Finding the Fourth Proportional to 330.45, 495.68 and 138.03

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Solution

The fourth proportional to 330.45, 495.68 and 138.03 is: 207.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.45 : 495.68 = 138.03 : x
  2. Step 2: Convert to fraction form
    330.45/495.68 = 138.03/x
  3. Step 3: Cross multiply
    330.45x = 495.68 × 138.03
  4. Step 4: Simplify right side
    330.45x = 68,418.02
  5. Step 5: Solve for x
    x = 68,418.02/330.45
  6. Step 6: Final answer
    x = 207.05

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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.