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Finding the Fourth Proportional to 429.67, 644.49 and 141.11

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Solution

The fourth proportional to 429.67, 644.49 and 141.11 is: 211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.67 : 644.49 = 141.11 : x
  2. Step 2: Convert to fraction form
    429.67/644.49 = 141.11/x
  3. Step 3: Cross multiply
    429.67x = 644.49 × 141.11
  4. Step 4: Simplify right side
    429.67x = 90,943.98
  5. Step 5: Solve for x
    x = 90,943.98/429.67
  6. Step 6: Final answer
    x = 211.66

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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.