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Finding the Fourth Proportional to 258.48, 388.53 and 257.67

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Solution

The fourth proportional to 258.48, 388.53 and 257.67 is: 387.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.48 : 388.53 = 257.67 : x
  2. Step 2: Convert to fraction form
    258.48/388.53 = 257.67/x
  3. Step 3: Cross multiply
    258.48x = 388.53 × 257.67
  4. Step 4: Simplify right side
    258.48x = 100,112.53
  5. Step 5: Solve for x
    x = 100,112.53/258.48
  6. Step 6: Final answer
    x = 387.31

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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.