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Finding the Fourth Proportional to 258.15, 387.20 and 75.54

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Solution

The fourth proportional to 258.15, 387.20 and 75.54 is: 113.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.15 : 387.20 = 75.54 : x
  2. Step 2: Convert to fraction form
    258.15/387.20 = 75.54/x
  3. Step 3: Cross multiply
    258.15x = 387.20 × 75.54
  4. Step 4: Simplify right side
    258.15x = 29,248.71
  5. Step 5: Solve for x
    x = 29,248.71/258.15
  6. Step 6: Final answer
    x = 113.30

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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.