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Finding the Fourth Proportional to 429.85, 644.82 and 137.37

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Solution

The fourth proportional to 429.85, 644.82 and 137.37 is: 206.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.85 : 644.82 = 137.37 : x
  2. Step 2: Convert to fraction form
    429.85/644.82 = 137.37/x
  3. Step 3: Cross multiply
    429.85x = 644.82 × 137.37
  4. Step 4: Simplify right side
    429.85x = 88,578.92
  5. Step 5: Solve for x
    x = 88,578.92/429.85
  6. Step 6: Final answer
    x = 206.07

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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.