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Finding the Fourth Proportional to 209.30, 288.51 and 165.56

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Solution

The fourth proportional to 209.30, 288.51 and 165.56 is: 228.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.30 : 288.51 = 165.56 : x
  2. Step 2: Convert to fraction form
    209.30/288.51 = 165.56/x
  3. Step 3: Cross multiply
    209.30x = 288.51 × 165.56
  4. Step 4: Simplify right side
    209.30x = 47,765.72
  5. Step 5: Solve for x
    x = 47,765.72/209.30
  6. Step 6: Final answer
    x = 228.22

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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.