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Finding the Fourth Proportional to 429.24, 644.16 and 320.72

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Solution

The fourth proportional to 429.24, 644.16 and 320.72 is: 481.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.24 : 644.16 = 320.72 : x
  2. Step 2: Convert to fraction form
    429.24/644.16 = 320.72/x
  3. Step 3: Cross multiply
    429.24x = 644.16 × 320.72
  4. Step 4: Simplify right side
    429.24x = 206,595.00
  5. Step 5: Solve for x
    x = 206,595.00/429.24
  6. Step 6: Final answer
    x = 481.30

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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.