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Finding the Fourth Proportional to 330.86, 456.39 and 291.61

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Solution

The fourth proportional to 330.86, 456.39 and 291.61 is: 402.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.86 : 456.39 = 291.61 : x
  2. Step 2: Convert to fraction form
    330.86/456.39 = 291.61/x
  3. Step 3: Cross multiply
    330.86x = 456.39 × 291.61
  4. Step 4: Simplify right side
    330.86x = 133,087.89
  5. Step 5: Solve for x
    x = 133,087.89/330.86
  6. Step 6: Final answer
    x = 402.25

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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.