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Finding the Fourth Proportional to 258.62, 385.79 and 231.28

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Solution

The fourth proportional to 258.62, 385.79 and 231.28 is: 345.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.62 : 385.79 = 231.28 : x
  2. Step 2: Convert to fraction form
    258.62/385.79 = 231.28/x
  3. Step 3: Cross multiply
    258.62x = 385.79 × 231.28
  4. Step 4: Simplify right side
    258.62x = 89,223.39
  5. Step 5: Solve for x
    x = 89,223.39/258.62
  6. Step 6: Final answer
    x = 345.00

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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.