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Finding the Fourth Proportional to 429.95, 644.72 and 213.27

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Solution

The fourth proportional to 429.95, 644.72 and 213.27 is: 319.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.95 : 644.72 = 213.27 : x
  2. Step 2: Convert to fraction form
    429.95/644.72 = 213.27/x
  3. Step 3: Cross multiply
    429.95x = 644.72 × 213.27
  4. Step 4: Simplify right side
    429.95x = 137,498.37
  5. Step 5: Solve for x
    x = 137,498.37/429.95
  6. Step 6: Final answer
    x = 319.80

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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.