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Finding the Fourth Proportional to 208.09, 287.02 and 149.13

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Solution

The fourth proportional to 208.09, 287.02 and 149.13 is: 205.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.09 : 287.02 = 149.13 : x
  2. Step 2: Convert to fraction form
    208.09/287.02 = 149.13/x
  3. Step 3: Cross multiply
    208.09x = 287.02 × 149.13
  4. Step 4: Simplify right side
    208.09x = 42,802.55
  5. Step 5: Solve for x
    x = 42,802.55/208.09
  6. Step 6: Final answer
    x = 205.69

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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.