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Finding the Fourth Proportional to 289.52, 399.27 and 191.11

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Solution

The fourth proportional to 289.52, 399.27 and 191.11 is: 263.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.52 : 399.27 = 191.11 : x
  2. Step 2: Convert to fraction form
    289.52/399.27 = 191.11/x
  3. Step 3: Cross multiply
    289.52x = 399.27 × 191.11
  4. Step 4: Simplify right side
    289.52x = 76,303.49
  5. Step 5: Solve for x
    x = 76,303.49/289.52
  6. Step 6: Final answer
    x = 263.55

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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.