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Finding the Fourth Proportional to 431.39, 647.33 and 157.56

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Solution

The fourth proportional to 431.39, 647.33 and 157.56 is: 236.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.39 : 647.33 = 157.56 : x
  2. Step 2: Convert to fraction form
    431.39/647.33 = 157.56/x
  3. Step 3: Cross multiply
    431.39x = 647.33 × 157.56
  4. Step 4: Simplify right side
    431.39x = 101,992.53
  5. Step 5: Solve for x
    x = 101,992.53/431.39
  6. Step 6: Final answer
    x = 236.43

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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.