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Finding the Fourth Proportional to 150.49, 207.69 and 85

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Solution

The fourth proportional to 150.49, 207.69 and 85 is: 117.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.49 : 207.69 = 85 : x
  2. Step 2: Convert to fraction form
    150.49/207.69 = 85/x
  3. Step 3: Cross multiply
    150.49x = 207.69 × 85
  4. Step 4: Simplify right side
    150.49x = 17,653.65
  5. Step 5: Solve for x
    x = 17,653.65/150.49
  6. Step 6: Final answer
    x = 117.31

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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.