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Finding the Fourth Proportional to 324.75, 487.28 and 142.12

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Solution

The fourth proportional to 324.75, 487.28 and 142.12 is: 213.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.75 : 487.28 = 142.12 : x
  2. Step 2: Convert to fraction form
    324.75/487.28 = 142.12/x
  3. Step 3: Cross multiply
    324.75x = 487.28 × 142.12
  4. Step 4: Simplify right side
    324.75x = 69,254.24
  5. Step 5: Solve for x
    x = 69,254.24/324.75
  6. Step 6: Final answer
    x = 213.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.