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Finding the Fourth Proportional to 289.12, 399 and 191

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Solution

The fourth proportional to 289.12, 399 and 191 is: 263.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.12 : 399 = 191 : x
  2. Step 2: Convert to fraction form
    289.12/399 = 191/x
  3. Step 3: Cross multiply
    289.12x = 399 × 191
  4. Step 4: Simplify right side
    289.12x = 76,209
  5. Step 5: Solve for x
    x = 76,209/289.12
  6. Step 6: Final answer
    x = 263.59

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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.