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Finding the Fourth Proportional to 289.76, 399.60 and 206.90

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Solution

The fourth proportional to 289.76, 399.60 and 206.90 is: 285.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.76 : 399.60 = 206.90 : x
  2. Step 2: Convert to fraction form
    289.76/399.60 = 206.90/x
  3. Step 3: Cross multiply
    289.76x = 399.60 × 206.90
  4. Step 4: Simplify right side
    289.76x = 82,677.24
  5. Step 5: Solve for x
    x = 82,677.24/289.76
  6. Step 6: Final answer
    x = 285.33

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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.