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Finding the Fourth Proportional to 429.22, 643.90 and 140.62

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Solution

The fourth proportional to 429.22, 643.90 and 140.62 is: 210.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.22 : 643.90 = 140.62 : x
  2. Step 2: Convert to fraction form
    429.22/643.90 = 140.62/x
  3. Step 3: Cross multiply
    429.22x = 643.90 × 140.62
  4. Step 4: Simplify right side
    429.22x = 90,545.22
  5. Step 5: Solve for x
    x = 90,545.22/429.22
  6. Step 6: Final answer
    x = 210.95

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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.