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Finding the Fourth Proportional to 208.10, 287.10 and 125.18

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Solution

The fourth proportional to 208.10, 287.10 and 125.18 is: 172.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.10 : 287.10 = 125.18 : x
  2. Step 2: Convert to fraction form
    208.10/287.10 = 125.18/x
  3. Step 3: Cross multiply
    208.10x = 287.10 × 125.18
  4. Step 4: Simplify right side
    208.10x = 35,939.18
  5. Step 5: Solve for x
    x = 35,939.18/208.10
  6. Step 6: Final answer
    x = 172.70

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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.