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Finding the Fourth Proportional to 331.12, 496.63 and 87.66

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Solution

The fourth proportional to 331.12, 496.63 and 87.66 is: 131.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.12 : 496.63 = 87.66 : x
  2. Step 2: Convert to fraction form
    331.12/496.63 = 87.66/x
  3. Step 3: Cross multiply
    331.12x = 496.63 × 87.66
  4. Step 4: Simplify right side
    331.12x = 43,534.37
  5. Step 5: Solve for x
    x = 43,534.37/331.12
  6. Step 6: Final answer
    x = 131.48

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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.