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Finding the Fourth Proportional to 285, 393.24 and 191.76

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Solution

The fourth proportional to 285, 393.24 and 191.76 is: 264.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    285 : 393.24 = 191.76 : x
  2. Step 2: Convert to fraction form
    285/393.24 = 191.76/x
  3. Step 3: Cross multiply
    285x = 393.24 × 191.76
  4. Step 4: Simplify right side
    285x = 75,407.70
  5. Step 5: Solve for x
    x = 75,407.70/285
  6. Step 6: Final answer
    x = 264.59

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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.