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Finding the Fourth Proportional to 324.54, 486.70 and 129.45

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Solution

The fourth proportional to 324.54, 486.70 and 129.45 is: 194.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.54 : 486.70 = 129.45 : x
  2. Step 2: Convert to fraction form
    324.54/486.70 = 129.45/x
  3. Step 3: Cross multiply
    324.54x = 486.70 × 129.45
  4. Step 4: Simplify right side
    324.54x = 63,003.32
  5. Step 5: Solve for x
    x = 63,003.32/324.54
  6. Step 6: Final answer
    x = 194.13

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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.