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Finding the Fourth Proportional to 311.48, 430.00 and 212.42

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Solution

The fourth proportional to 311.48, 430.00 and 212.42 is: 293.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.48 : 430.00 = 212.42 : x
  2. Step 2: Convert to fraction form
    311.48/430.00 = 212.42/x
  3. Step 3: Cross multiply
    311.48x = 430.00 × 212.42
  4. Step 4: Simplify right side
    311.48x = 91,338.72
  5. Step 5: Solve for x
    x = 91,338.72/311.48
  6. Step 6: Final answer
    x = 293.24

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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.