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Finding the Fourth Proportional to 431.82, 647.33 and 157.85

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Solution

The fourth proportional to 431.82, 647.33 and 157.85 is: 236.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.82 : 647.33 = 157.85 : x
  2. Step 2: Convert to fraction form
    431.82/647.33 = 157.85/x
  3. Step 3: Cross multiply
    431.82x = 647.33 × 157.85
  4. Step 4: Simplify right side
    431.82x = 102,181.04
  5. Step 5: Solve for x
    x = 102,181.04/431.82
  6. Step 6: Final answer
    x = 236.63

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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.