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Finding the Fourth Proportional to 429.05, 643.23 and 197.82

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Solution

The fourth proportional to 429.05, 643.23 and 197.82 is: 296.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.05 : 643.23 = 197.82 : x
  2. Step 2: Convert to fraction form
    429.05/643.23 = 197.82/x
  3. Step 3: Cross multiply
    429.05x = 643.23 × 197.82
  4. Step 4: Simplify right side
    429.05x = 127,243.76
  5. Step 5: Solve for x
    x = 127,243.76/429.05
  6. Step 6: Final answer
    x = 296.57

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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.