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Finding the Fourth Proportional to 330.36, 455.48 and 212.12

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Solution

The fourth proportional to 330.36, 455.48 and 212.12 is: 292.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.36 : 455.48 = 212.12 : x
  2. Step 2: Convert to fraction form
    330.36/455.48 = 212.12/x
  3. Step 3: Cross multiply
    330.36x = 455.48 × 212.12
  4. Step 4: Simplify right side
    330.36x = 96,616.42
  5. Step 5: Solve for x
    x = 96,616.42/330.36
  6. Step 6: Final answer
    x = 292.46

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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.