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Finding the Fourth Proportional to 324.29, 489.09 and 318.53

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Solution

The fourth proportional to 324.29, 489.09 and 318.53 is: 480.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.29 : 489.09 = 318.53 : x
  2. Step 2: Convert to fraction form
    324.29/489.09 = 318.53/x
  3. Step 3: Cross multiply
    324.29x = 489.09 × 318.53
  4. Step 4: Simplify right side
    324.29x = 155,789.84
  5. Step 5: Solve for x
    x = 155,789.84/324.29
  6. Step 6: Final answer
    x = 480.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.