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Finding the Fourth Proportional to 258.11, 387.23 and 75.51

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Solution

The fourth proportional to 258.11, 387.23 and 75.51 is: 113.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.11 : 387.23 = 75.51 : x
  2. Step 2: Convert to fraction form
    258.11/387.23 = 75.51/x
  3. Step 3: Cross multiply
    258.11x = 387.23 × 75.51
  4. Step 4: Simplify right side
    258.11x = 29,237.42
  5. Step 5: Solve for x
    x = 29,237.42/258.11
  6. Step 6: Final answer
    x = 113.28

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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.