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Finding the Fourth Proportional to 386.19, 532.85 and 228.87

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Solution

The fourth proportional to 386.19, 532.85 and 228.87 is: 315.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.19 : 532.85 = 228.87 : x
  2. Step 2: Convert to fraction form
    386.19/532.85 = 228.87/x
  3. Step 3: Cross multiply
    386.19x = 532.85 × 228.87
  4. Step 4: Simplify right side
    386.19x = 121,951.95
  5. Step 5: Solve for x
    x = 121,951.95/386.19
  6. Step 6: Final answer
    x = 315.79

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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.