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Finding the Fourth Proportional to 191.81, 287.72 and 100.45

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Solution

The fourth proportional to 191.81, 287.72 and 100.45 is: 150.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.81 : 287.72 = 100.45 : x
  2. Step 2: Convert to fraction form
    191.81/287.72 = 100.45/x
  3. Step 3: Cross multiply
    191.81x = 287.72 × 100.45
  4. Step 4: Simplify right side
    191.81x = 28,901.47
  5. Step 5: Solve for x
    x = 28,901.47/191.81
  6. Step 6: Final answer
    x = 150.68

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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.