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Finding the Fourth Proportional to 429.51, 644.26 and 121.36

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Solution

The fourth proportional to 429.51, 644.26 and 121.36 is: 182.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.51 : 644.26 = 121.36 : x
  2. Step 2: Convert to fraction form
    429.51/644.26 = 121.36/x
  3. Step 3: Cross multiply
    429.51x = 644.26 × 121.36
  4. Step 4: Simplify right side
    429.51x = 78,187.39
  5. Step 5: Solve for x
    x = 78,187.39/429.51
  6. Step 6: Final answer
    x = 182.04

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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.