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Finding the Fourth Proportional to 429.40, 644.08 and 121.24

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Solution

The fourth proportional to 429.40, 644.08 and 121.24 is: 181.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.40 : 644.08 = 121.24 : x
  2. Step 2: Convert to fraction form
    429.40/644.08 = 121.24/x
  3. Step 3: Cross multiply
    429.40x = 644.08 × 121.24
  4. Step 4: Simplify right side
    429.40x = 78,088.26
  5. Step 5: Solve for x
    x = 78,088.26/429.40
  6. Step 6: Final answer
    x = 181.85

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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.