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Finding the Fourth Proportional to 208, 287.16 and 139.12

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Solution

The fourth proportional to 208, 287.16 and 139.12 is: 192.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    208 : 287.16 = 139.12 : x
  2. Step 2: Convert to fraction form
    208/287.16 = 139.12/x
  3. Step 3: Cross multiply
    208x = 287.16 × 139.12
  4. Step 4: Simplify right side
    208x = 39,949.70
  5. Step 5: Solve for x
    x = 39,949.70/208
  6. Step 6: Final answer
    x = 192.07

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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.