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Finding the Fourth Proportional to 429.64, 644.34 and 255.64

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Solution

The fourth proportional to 429.64, 644.34 and 255.64 is: 383.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.64 : 644.34 = 255.64 : x
  2. Step 2: Convert to fraction form
    429.64/644.34 = 255.64/x
  3. Step 3: Cross multiply
    429.64x = 644.34 × 255.64
  4. Step 4: Simplify right side
    429.64x = 164,719.08
  5. Step 5: Solve for x
    x = 164,719.08/429.64
  6. Step 6: Final answer
    x = 383.39

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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.