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Finding the Fourth Proportional to 429.57, 643.95 and 165.85

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Solution

The fourth proportional to 429.57, 643.95 and 165.85 is: 248.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.57 : 643.95 = 165.85 : x
  2. Step 2: Convert to fraction form
    429.57/643.95 = 165.85/x
  3. Step 3: Cross multiply
    429.57x = 643.95 × 165.85
  4. Step 4: Simplify right side
    429.57x = 106,797.50
  5. Step 5: Solve for x
    x = 106,797.50/429.57
  6. Step 6: Final answer
    x = 248.61

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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.