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Finding the Fourth Proportional to 429.21, 644.02 and 212.76

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Solution

The fourth proportional to 429.21, 644.02 and 212.76 is: 319.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.21 : 644.02 = 212.76 : x
  2. Step 2: Convert to fraction form
    429.21/644.02 = 212.76/x
  3. Step 3: Cross multiply
    429.21x = 644.02 × 212.76
  4. Step 4: Simplify right side
    429.21x = 137,021.16
  5. Step 5: Solve for x
    x = 137,021.16/429.21
  6. Step 6: Final answer
    x = 319.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.