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Finding the Fourth Proportional to 429.91, 644.71 and 137.35

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Solution

The fourth proportional to 429.91, 644.71 and 137.35 is: 205.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.91 : 644.71 = 137.35 : x
  2. Step 2: Convert to fraction form
    429.91/644.71 = 137.35/x
  3. Step 3: Cross multiply
    429.91x = 644.71 × 137.35
  4. Step 4: Simplify right side
    429.91x = 88,548.01
  5. Step 5: Solve for x
    x = 88,548.01/429.91
  6. Step 6: Final answer
    x = 205.97

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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.