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Finding the Fourth Proportional to 285, 393.15 and 191.59

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Solution

The fourth proportional to 285, 393.15 and 191.59 is: 264.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    285 : 393.15 = 191.59 : x
  2. Step 2: Convert to fraction form
    285/393.15 = 191.59/x
  3. Step 3: Cross multiply
    285x = 393.15 × 191.59
  4. Step 4: Simplify right side
    285x = 75,321.64
  5. Step 5: Solve for x
    x = 75,321.64/285
  6. Step 6: Final answer
    x = 264.29

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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.