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Finding the Fourth Proportional to 429.78, 644.52 and 141.18

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Solution

The fourth proportional to 429.78, 644.52 and 141.18 is: 211.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.78 : 644.52 = 141.18 : x
  2. Step 2: Convert to fraction form
    429.78/644.52 = 141.18/x
  3. Step 3: Cross multiply
    429.78x = 644.52 × 141.18
  4. Step 4: Simplify right side
    429.78x = 90,993.33
  5. Step 5: Solve for x
    x = 90,993.33/429.78
  6. Step 6: Final answer
    x = 211.72

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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.