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Finding the Fourth Proportional to 265.72, 399.12 and 197.68

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Solution

The fourth proportional to 265.72, 399.12 and 197.68 is: 296.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.72 : 399.12 = 197.68 : x
  2. Step 2: Convert to fraction form
    265.72/399.12 = 197.68/x
  3. Step 3: Cross multiply
    265.72x = 399.12 × 197.68
  4. Step 4: Simplify right side
    265.72x = 78,898.04
  5. Step 5: Solve for x
    x = 78,898.04/265.72
  6. Step 6: Final answer
    x = 296.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.