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Finding the Fourth Proportional to 209.61, 289.31 and 151.29

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Solution

The fourth proportional to 209.61, 289.31 and 151.29 is: 208.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.61 : 289.31 = 151.29 : x
  2. Step 2: Convert to fraction form
    209.61/289.31 = 151.29/x
  3. Step 3: Cross multiply
    209.61x = 289.31 × 151.29
  4. Step 4: Simplify right side
    209.61x = 43,768.95
  5. Step 5: Solve for x
    x = 43,768.95/209.61
  6. Step 6: Final answer
    x = 208.81

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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.