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Finding the Fourth Proportional to 330.47, 456.29 and 212.61

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Solution

The fourth proportional to 330.47, 456.29 and 212.61 is: 293.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.47 : 456.29 = 212.61 : x
  2. Step 2: Convert to fraction form
    330.47/456.29 = 212.61/x
  3. Step 3: Cross multiply
    330.47x = 456.29 × 212.61
  4. Step 4: Simplify right side
    330.47x = 97,010.75
  5. Step 5: Solve for x
    x = 97,010.75/330.47
  6. Step 6: Final answer
    x = 293.56

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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.