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Finding the Fourth Proportional to 150.92, 208.31 and 85.45

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Solution

The fourth proportional to 150.92, 208.31 and 85.45 is: 117.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.92 : 208.31 = 85.45 : x
  2. Step 2: Convert to fraction form
    150.92/208.31 = 85.45/x
  3. Step 3: Cross multiply
    150.92x = 208.31 × 85.45
  4. Step 4: Simplify right side
    150.92x = 17,799.05
  5. Step 5: Solve for x
    x = 17,799.05/150.92
  6. Step 6: Final answer
    x = 117.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.