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Finding the Fourth Proportional to 384.92, 531 and 229.64

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Solution

The fourth proportional to 384.92, 531 and 229.64 is: 316.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.92 : 531 = 229.64 : x
  2. Step 2: Convert to fraction form
    384.92/531 = 229.64/x
  3. Step 3: Cross multiply
    384.92x = 531 × 229.64
  4. Step 4: Simplify right side
    384.92x = 121,938.84
  5. Step 5: Solve for x
    x = 121,938.84/384.92
  6. Step 6: Final answer
    x = 316.79

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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.