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Finding the Fourth Proportional to 258.75, 387.52 and 228.78

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Solution

The fourth proportional to 258.75, 387.52 and 228.78 is: 342.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.75 : 387.52 = 228.78 : x
  2. Step 2: Convert to fraction form
    258.75/387.52 = 228.78/x
  3. Step 3: Cross multiply
    258.75x = 387.52 × 228.78
  4. Step 4: Simplify right side
    258.75x = 88,656.25
  5. Step 5: Solve for x
    x = 88,656.25/258.75
  6. Step 6: Final answer
    x = 342.63

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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.