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Finding the Fourth Proportional to 208.10, 287.19 and 149.91

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Solution

The fourth proportional to 208.10, 287.19 and 149.91 is: 206.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.10 : 287.19 = 149.91 : x
  2. Step 2: Convert to fraction form
    208.10/287.19 = 149.91/x
  3. Step 3: Cross multiply
    208.10x = 287.19 × 149.91
  4. Step 4: Simplify right side
    208.10x = 43,052.65
  5. Step 5: Solve for x
    x = 43,052.65/208.10
  6. Step 6: Final answer
    x = 206.89

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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.