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Finding the Fourth Proportional to 386.19, 532.91 and 228.82

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Solution

The fourth proportional to 386.19, 532.91 and 228.82 is: 315.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.19 : 532.91 = 228.82 : x
  2. Step 2: Convert to fraction form
    386.19/532.91 = 228.82/x
  3. Step 3: Cross multiply
    386.19x = 532.91 × 228.82
  4. Step 4: Simplify right side
    386.19x = 121,939.42
  5. Step 5: Solve for x
    x = 121,939.42/386.19
  6. Step 6: Final answer
    x = 315.75

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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.