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Finding the Fourth Proportional to 429.44, 644.26 and 140.90

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Solution

The fourth proportional to 429.44, 644.26 and 140.90 is: 211.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.44 : 644.26 = 140.90 : x
  2. Step 2: Convert to fraction form
    429.44/644.26 = 140.90/x
  3. Step 3: Cross multiply
    429.44x = 644.26 × 140.90
  4. Step 4: Simplify right side
    429.44x = 90,776.23
  5. Step 5: Solve for x
    x = 90,776.23/429.44
  6. Step 6: Final answer
    x = 211.38

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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.