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Finding the Fourth Proportional to 191.81, 287.81 and 100.55

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Solution

The fourth proportional to 191.81, 287.81 and 100.55 is: 150.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.81 : 287.81 = 100.55 : x
  2. Step 2: Convert to fraction form
    191.81/287.81 = 100.55/x
  3. Step 3: Cross multiply
    191.81x = 287.81 × 100.55
  4. Step 4: Simplify right side
    191.81x = 28,940.02
  5. Step 5: Solve for x
    x = 28,940.02/191.81
  6. Step 6: Final answer
    x = 150.88

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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.