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Finding the Fourth Proportional to 150.51, 225.39 and 81.87

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Solution

The fourth proportional to 150.51, 225.39 and 81.87 is: 122.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.51 : 225.39 = 81.87 : x
  2. Step 2: Convert to fraction form
    150.51/225.39 = 81.87/x
  3. Step 3: Cross multiply
    150.51x = 225.39 × 81.87
  4. Step 4: Simplify right side
    150.51x = 18,452.68
  5. Step 5: Solve for x
    x = 18,452.68/150.51
  6. Step 6: Final answer
    x = 122.60

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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.