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Finding the Fourth Proportional to 208.72, 288.08 and 143.25

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Solution

The fourth proportional to 208.72, 288.08 and 143.25 is: 197.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.72 : 288.08 = 143.25 : x
  2. Step 2: Convert to fraction form
    208.72/288.08 = 143.25/x
  3. Step 3: Cross multiply
    208.72x = 288.08 × 143.25
  4. Step 4: Simplify right side
    208.72x = 41,267.46
  5. Step 5: Solve for x
    x = 41,267.46/208.72
  6. Step 6: Final answer
    x = 197.72

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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.