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Finding the Fourth Proportional to 330, 495 and 208.40

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Solution

The fourth proportional to 330, 495 and 208.40 is: 312.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    330 : 495 = 208.40 : x
  2. Step 2: Convert to fraction form
    330/495 = 208.40/x
  3. Step 3: Cross multiply
    330x = 495 × 208.40
  4. Step 4: Simplify right side
    330x = 103,158
  5. Step 5: Solve for x
    x = 103,158/330
  6. Step 6: Final answer
    x = 312.60

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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.