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Finding the Fourth Proportional to 385.38, 531.84 and 228.12

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Solution

The fourth proportional to 385.38, 531.84 and 228.12 is: 314.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.38 : 531.84 = 228.12 : x
  2. Step 2: Convert to fraction form
    385.38/531.84 = 228.12/x
  3. Step 3: Cross multiply
    385.38x = 531.84 × 228.12
  4. Step 4: Simplify right side
    385.38x = 121,323.34
  5. Step 5: Solve for x
    x = 121,323.34/385.38
  6. Step 6: Final answer
    x = 314.81

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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.