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Finding the Fourth Proportional to 100.45, 150.38 and 67.87

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Solution

The fourth proportional to 100.45, 150.38 and 67.87 is: 101.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.45 : 150.38 = 67.87 : x
  2. Step 2: Convert to fraction form
    100.45/150.38 = 67.87/x
  3. Step 3: Cross multiply
    100.45x = 150.38 × 67.87
  4. Step 4: Simplify right side
    100.45x = 10,206.29
  5. Step 5: Solve for x
    x = 10,206.29/100.45
  6. Step 6: Final answer
    x = 101.61

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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.