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Finding the Fourth Proportional to 330.21, 456.23 and 311.99

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Solution

The fourth proportional to 330.21, 456.23 and 311.99 is: 431.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.21 : 456.23 = 311.99 : x
  2. Step 2: Convert to fraction form
    330.21/456.23 = 311.99/x
  3. Step 3: Cross multiply
    330.21x = 456.23 × 311.99
  4. Step 4: Simplify right side
    330.21x = 142,337.70
  5. Step 5: Solve for x
    x = 142,337.70/330.21
  6. Step 6: Final answer
    x = 431.05

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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.