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Finding the Fourth Proportional to 330.48, 456.21 and 218.52

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Solution

The fourth proportional to 330.48, 456.21 and 218.52 is: 301.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.48 : 456.21 = 218.52 : x
  2. Step 2: Convert to fraction form
    330.48/456.21 = 218.52/x
  3. Step 3: Cross multiply
    330.48x = 456.21 × 218.52
  4. Step 4: Simplify right side
    330.48x = 99,690.77
  5. Step 5: Solve for x
    x = 99,690.77/330.48
  6. Step 6: Final answer
    x = 301.65

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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.