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Finding the Fourth Proportional to 429.44, 644.34 and 308.66

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Solution

The fourth proportional to 429.44, 644.34 and 308.66 is: 463.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.44 : 644.34 = 308.66 : x
  2. Step 2: Convert to fraction form
    429.44/644.34 = 308.66/x
  3. Step 3: Cross multiply
    429.44x = 644.34 × 308.66
  4. Step 4: Simplify right side
    429.44x = 198,881.98
  5. Step 5: Solve for x
    x = 198,881.98/429.44
  6. Step 6: Final answer
    x = 463.12

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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.