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Finding the Fourth Proportional to 328.15, 453.08 and 217.85

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Solution

The fourth proportional to 328.15, 453.08 and 217.85 is: 300.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.15 : 453.08 = 217.85 : x
  2. Step 2: Convert to fraction form
    328.15/453.08 = 217.85/x
  3. Step 3: Cross multiply
    328.15x = 453.08 × 217.85
  4. Step 4: Simplify right side
    328.15x = 98,703.52
  5. Step 5: Solve for x
    x = 98,703.52/328.15
  6. Step 6: Final answer
    x = 300.79

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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.