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Finding the Fourth Proportional to 325.98, 449.70 and 311.76

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Solution

The fourth proportional to 325.98, 449.70 and 311.76 is: 430.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.98 : 449.70 = 311.76 : x
  2. Step 2: Convert to fraction form
    325.98/449.70 = 311.76/x
  3. Step 3: Cross multiply
    325.98x = 449.70 × 311.76
  4. Step 4: Simplify right side
    325.98x = 140,198.47
  5. Step 5: Solve for x
    x = 140,198.47/325.98
  6. Step 6: Final answer
    x = 430.08

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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.