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Finding the Fourth Proportional to 289.52, 399.64 and 196.40

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Solution

The fourth proportional to 289.52, 399.64 and 196.40 is: 271.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.52 : 399.64 = 196.40 : x
  2. Step 2: Convert to fraction form
    289.52/399.64 = 196.40/x
  3. Step 3: Cross multiply
    289.52x = 399.64 × 196.40
  4. Step 4: Simplify right side
    289.52x = 78,489.30
  5. Step 5: Solve for x
    x = 78,489.30/289.52
  6. Step 6: Final answer
    x = 271.10

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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.