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Finding the Fourth Proportional to 330.72, 456.12 and 286.56

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Solution

The fourth proportional to 330.72, 456.12 and 286.56 is: 395.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.72 : 456.12 = 286.56 : x
  2. Step 2: Convert to fraction form
    330.72/456.12 = 286.56/x
  3. Step 3: Cross multiply
    330.72x = 456.12 × 286.56
  4. Step 4: Simplify right side
    330.72x = 130,705.75
  5. Step 5: Solve for x
    x = 130,705.75/330.72
  6. Step 6: Final answer
    x = 395.22

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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.