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Finding the Fourth Proportional to 429.83, 644.50 and 137.28

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Solution

The fourth proportional to 429.83, 644.50 and 137.28 is: 205.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.83 : 644.50 = 137.28 : x
  2. Step 2: Convert to fraction form
    429.83/644.50 = 137.28/x
  3. Step 3: Cross multiply
    429.83x = 644.50 × 137.28
  4. Step 4: Simplify right side
    429.83x = 88,476.96
  5. Step 5: Solve for x
    x = 88,476.96/429.83
  6. Step 6: Final answer
    x = 205.84

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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.