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Finding the Fourth Proportional to 330.26, 495.36 and 208.40

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Solution

The fourth proportional to 330.26, 495.36 and 208.40 is: 312.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.26 : 495.36 = 208.40 : x
  2. Step 2: Convert to fraction form
    330.26/495.36 = 208.40/x
  3. Step 3: Cross multiply
    330.26x = 495.36 × 208.40
  4. Step 4: Simplify right side
    330.26x = 103,233.02
  5. Step 5: Solve for x
    x = 103,233.02/330.26
  6. Step 6: Final answer
    x = 312.58

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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.