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Finding the Fourth Proportional to 328.70, 453.48 and 197.66

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Solution

The fourth proportional to 328.70, 453.48 and 197.66 is: 272.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.70 : 453.48 = 197.66 : x
  2. Step 2: Convert to fraction form
    328.70/453.48 = 197.66/x
  3. Step 3: Cross multiply
    328.70x = 453.48 × 197.66
  4. Step 4: Simplify right side
    328.70x = 89,634.86
  5. Step 5: Solve for x
    x = 89,634.86/328.70
  6. Step 6: Final answer
    x = 272.70

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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.