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Finding the Fourth Proportional to 429.98, 644.98 and 213.56

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Solution

The fourth proportional to 429.98, 644.98 and 213.56 is: 320.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.98 : 644.98 = 213.56 : x
  2. Step 2: Convert to fraction form
    429.98/644.98 = 213.56/x
  3. Step 3: Cross multiply
    429.98x = 644.98 × 213.56
  4. Step 4: Simplify right side
    429.98x = 137,741.93
  5. Step 5: Solve for x
    x = 137,741.93/429.98
  6. Step 6: Final answer
    x = 320.34

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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.