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Finding the Fourth Proportional to 208.24, 286.92 and 139.12

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Solution

The fourth proportional to 208.24, 286.92 and 139.12 is: 191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.24 : 286.92 = 139.12 : x
  2. Step 2: Convert to fraction form
    208.24/286.92 = 139.12/x
  3. Step 3: Cross multiply
    208.24x = 286.92 × 139.12
  4. Step 4: Simplify right side
    208.24x = 39,916.31
  5. Step 5: Solve for x
    x = 39,916.31/208.24
  6. Step 6: Final answer
    x = 191.68

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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.