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Finding the Fourth Proportional to 429.64, 644.46 and 259.72

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Solution

The fourth proportional to 429.64, 644.46 and 259.72 is: 389.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.64 : 644.46 = 259.72 : x
  2. Step 2: Convert to fraction form
    429.64/644.46 = 259.72/x
  3. Step 3: Cross multiply
    429.64x = 644.46 × 259.72
  4. Step 4: Simplify right side
    429.64x = 167,379.15
  5. Step 5: Solve for x
    x = 167,379.15/429.64
  6. Step 6: Final answer
    x = 389.58

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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.