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Finding the Fourth Proportional to 330.05, 455.47 and 190.20

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Solution

The fourth proportional to 330.05, 455.47 and 190.20 is: 262.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.05 : 455.47 = 190.20 : x
  2. Step 2: Convert to fraction form
    330.05/455.47 = 190.20/x
  3. Step 3: Cross multiply
    330.05x = 455.47 × 190.20
  4. Step 4: Simplify right side
    330.05x = 86,630.13
  5. Step 5: Solve for x
    x = 86,630.13/330.05
  6. Step 6: Final answer
    x = 262.48

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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.