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Finding the Fourth Proportional to 429.26, 643.74 and 169.25

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Solution

The fourth proportional to 429.26, 643.74 and 169.25 is: 253.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.26 : 643.74 = 169.25 : x
  2. Step 2: Convert to fraction form
    429.26/643.74 = 169.25/x
  3. Step 3: Cross multiply
    429.26x = 643.74 × 169.25
  4. Step 4: Simplify right side
    429.26x = 108,953.00
  5. Step 5: Solve for x
    x = 108,953.00/429.26
  6. Step 6: Final answer
    x = 253.82

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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.