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Finding the Fourth Proportional to 429.75, 644.55 and 121.56

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Solution

The fourth proportional to 429.75, 644.55 and 121.56 is: 182.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.75 : 644.55 = 121.56 : x
  2. Step 2: Convert to fraction form
    429.75/644.55 = 121.56/x
  3. Step 3: Cross multiply
    429.75x = 644.55 × 121.56
  4. Step 4: Simplify right side
    429.75x = 78,351.50
  5. Step 5: Solve for x
    x = 78,351.50/429.75
  6. Step 6: Final answer
    x = 182.32

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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.