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Finding the Fourth Proportional to 209.72, 289.40 and 116.47

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Solution

The fourth proportional to 209.72, 289.40 and 116.47 is: 160.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.72 : 289.40 = 116.47 : x
  2. Step 2: Convert to fraction form
    209.72/289.40 = 116.47/x
  3. Step 3: Cross multiply
    209.72x = 289.40 × 116.47
  4. Step 4: Simplify right side
    209.72x = 33,706.42
  5. Step 5: Solve for x
    x = 33,706.42/209.72
  6. Step 6: Final answer
    x = 160.72

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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.