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Finding the Fourth Proportional to 324.55, 485.90 and 259.66

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Solution

The fourth proportional to 324.55, 485.90 and 259.66 is: 388.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.55 : 485.90 = 259.66 : x
  2. Step 2: Convert to fraction form
    324.55/485.90 = 259.66/x
  3. Step 3: Cross multiply
    324.55x = 485.90 × 259.66
  4. Step 4: Simplify right side
    324.55x = 126,165.07
  5. Step 5: Solve for x
    x = 126,165.07/324.55
  6. Step 6: Final answer
    x = 388.74

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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.