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Finding the Fourth Proportional to 259.02, 357.21 and 231.66

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Solution

The fourth proportional to 259.02, 357.21 and 231.66 is: 319.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.02 : 357.21 = 231.66 : x
  2. Step 2: Convert to fraction form
    259.02/357.21 = 231.66/x
  3. Step 3: Cross multiply
    259.02x = 357.21 × 231.66
  4. Step 4: Simplify right side
    259.02x = 82,751.27
  5. Step 5: Solve for x
    x = 82,751.27/259.02
  6. Step 6: Final answer
    x = 319.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.