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Finding the Fourth Proportional to 208.68, 288.28 and 143.48

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Solution

The fourth proportional to 208.68, 288.28 and 143.48 is: 198.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.68 : 288.28 = 143.48 : x
  2. Step 2: Convert to fraction form
    208.68/288.28 = 143.48/x
  3. Step 3: Cross multiply
    208.68x = 288.28 × 143.48
  4. Step 4: Simplify right side
    208.68x = 41,362.41
  5. Step 5: Solve for x
    x = 41,362.41/208.68
  6. Step 6: Final answer
    x = 198.21

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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.