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Finding the Fourth Proportional to 150.96, 208.30 and 85.43

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Solution

The fourth proportional to 150.96, 208.30 and 85.43 is: 117.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.96 : 208.30 = 85.43 : x
  2. Step 2: Convert to fraction form
    150.96/208.30 = 85.43/x
  3. Step 3: Cross multiply
    150.96x = 208.30 × 85.43
  4. Step 4: Simplify right side
    150.96x = 17,794.71
  5. Step 5: Solve for x
    x = 17,794.71/150.96
  6. Step 6: Final answer
    x = 117.87

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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.