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Finding the Fourth Proportional to 330.74, 456.60 and 247.81

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Solution

The fourth proportional to 330.74, 456.60 and 247.81 is: 342.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.74 : 456.60 = 247.81 : x
  2. Step 2: Convert to fraction form
    330.74/456.60 = 247.81/x
  3. Step 3: Cross multiply
    330.74x = 456.60 × 247.81
  4. Step 4: Simplify right side
    330.74x = 113,150.05
  5. Step 5: Solve for x
    x = 113,150.05/330.74
  6. Step 6: Final answer
    x = 342.11

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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.