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Finding the Fourth Proportional to 191.74, 287.72 and 100.49

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Solution

The fourth proportional to 191.74, 287.72 and 100.49 is: 150.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.74 : 287.72 = 100.49 : x
  2. Step 2: Convert to fraction form
    191.74/287.72 = 100.49/x
  3. Step 3: Cross multiply
    191.74x = 287.72 × 100.49
  4. Step 4: Simplify right side
    191.74x = 28,912.48
  5. Step 5: Solve for x
    x = 28,912.48/191.74
  6. Step 6: Final answer
    x = 150.79

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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.