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Finding the Fourth Proportional to 285.11, 393.30 and 191.88

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Solution

The fourth proportional to 285.11, 393.30 and 191.88 is: 264.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.11 : 393.30 = 191.88 : x
  2. Step 2: Convert to fraction form
    285.11/393.30 = 191.88/x
  3. Step 3: Cross multiply
    285.11x = 393.30 × 191.88
  4. Step 4: Simplify right side
    285.11x = 75,466.40
  5. Step 5: Solve for x
    x = 75,466.40/285.11
  6. Step 6: Final answer
    x = 264.69

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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.