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Finding the Fourth Proportional to 289.08, 398.66 and 206.15

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Solution

The fourth proportional to 289.08, 398.66 and 206.15 is: 284.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.08 : 398.66 = 206.15 : x
  2. Step 2: Convert to fraction form
    289.08/398.66 = 206.15/x
  3. Step 3: Cross multiply
    289.08x = 398.66 × 206.15
  4. Step 4: Simplify right side
    289.08x = 82,180.73
  5. Step 5: Solve for x
    x = 82,180.73/289.08
  6. Step 6: Final answer
    x = 284.28

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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.