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Finding the Fourth Proportional to 429.08, 643.53 and 120.97

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Solution

The fourth proportional to 429.08, 643.53 and 120.97 is: 181.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.08 : 643.53 = 120.97 : x
  2. Step 2: Convert to fraction form
    429.08/643.53 = 120.97/x
  3. Step 3: Cross multiply
    429.08x = 643.53 × 120.97
  4. Step 4: Simplify right side
    429.08x = 77,846.22
  5. Step 5: Solve for x
    x = 77,846.22/429.08
  6. Step 6: Final answer
    x = 181.42

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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.