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Finding the Fourth Proportional to 258.80, 386.18 and 231.46

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Solution

The fourth proportional to 258.80, 386.18 and 231.46 is: 345.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.80 : 386.18 = 231.46 : x
  2. Step 2: Convert to fraction form
    258.80/386.18 = 231.46/x
  3. Step 3: Cross multiply
    258.80x = 386.18 × 231.46
  4. Step 4: Simplify right side
    258.80x = 89,385.22
  5. Step 5: Solve for x
    x = 89,385.22/258.80
  6. Step 6: Final answer
    x = 345.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.