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Finding the Fourth Proportional to 478.28, 658.86 and 330.66

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Solution

The fourth proportional to 478.28, 658.86 and 330.66 is: 455.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.28 : 658.86 = 330.66 : x
  2. Step 2: Convert to fraction form
    478.28/658.86 = 330.66/x
  3. Step 3: Cross multiply
    478.28x = 658.86 × 330.66
  4. Step 4: Simplify right side
    478.28x = 217,858.65
  5. Step 5: Solve for x
    x = 217,858.65/478.28
  6. Step 6: Final answer
    x = 455.50

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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.