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Finding the Fourth Proportional to 429.89, 644.75 and 121.66

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Solution

The fourth proportional to 429.89, 644.75 and 121.66 is: 182.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.89 : 644.75 = 121.66 : x
  2. Step 2: Convert to fraction form
    429.89/644.75 = 121.66/x
  3. Step 3: Cross multiply
    429.89x = 644.75 × 121.66
  4. Step 4: Simplify right side
    429.89x = 78,442.25
  5. Step 5: Solve for x
    x = 78,442.25/429.89
  6. Step 6: Final answer
    x = 182.47

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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.