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Finding the Fourth Proportional to 386.05, 532.74 and 228.61

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Solution

The fourth proportional to 386.05, 532.74 and 228.61 is: 315.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.05 : 532.74 = 228.61 : x
  2. Step 2: Convert to fraction form
    386.05/532.74 = 228.61/x
  3. Step 3: Cross multiply
    386.05x = 532.74 × 228.61
  4. Step 4: Simplify right side
    386.05x = 121,789.69
  5. Step 5: Solve for x
    x = 121,789.69/386.05
  6. Step 6: Final answer
    x = 315.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.