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Finding the Fourth Proportional to 324.60, 486.80 and 129.55

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Solution

The fourth proportional to 324.60, 486.80 and 129.55 is: 194.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.60 : 486.80 = 129.55 : x
  2. Step 2: Convert to fraction form
    324.60/486.80 = 129.55/x
  3. Step 3: Cross multiply
    324.60x = 486.80 × 129.55
  4. Step 4: Simplify right side
    324.60x = 63,062.51
  5. Step 5: Solve for x
    x = 63,062.51/324.60
  6. Step 6: Final answer
    x = 194.28

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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.