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Finding the Fourth Proportional to 429.99, 644.77 and 254.47

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Solution

The fourth proportional to 429.99, 644.77 and 254.47 is: 381.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.99 : 644.77 = 254.47 : x
  2. Step 2: Convert to fraction form
    429.99/644.77 = 254.47/x
  3. Step 3: Cross multiply
    429.99x = 644.77 × 254.47
  4. Step 4: Simplify right side
    429.99x = 164,074.57
  5. Step 5: Solve for x
    x = 164,074.57/429.99
  6. Step 6: Final answer
    x = 381.58

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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.