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Finding the Fourth Proportional to 191.37, 287.09 and 69.63

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Solution

The fourth proportional to 191.37, 287.09 and 69.63 is: 104.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.37 : 287.09 = 69.63 : x
  2. Step 2: Convert to fraction form
    191.37/287.09 = 69.63/x
  3. Step 3: Cross multiply
    191.37x = 287.09 × 69.63
  4. Step 4: Simplify right side
    191.37x = 19,991.73
  5. Step 5: Solve for x
    x = 19,991.73/191.37
  6. Step 6: Final answer
    x = 104.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.