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Finding the Fourth Proportional to 258.29, 387.49 and 154.36

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Solution

The fourth proportional to 258.29, 387.49 and 154.36 is: 231.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.29 : 387.49 = 154.36 : x
  2. Step 2: Convert to fraction form
    258.29/387.49 = 154.36/x
  3. Step 3: Cross multiply
    258.29x = 387.49 × 154.36
  4. Step 4: Simplify right side
    258.29x = 59,812.38
  5. Step 5: Solve for x
    x = 59,812.38/258.29
  6. Step 6: Final answer
    x = 231.57

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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.