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Finding the Fourth Proportional to 331.35, 497.05 and 87.87

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Solution

The fourth proportional to 331.35, 497.05 and 87.87 is: 131.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.35 : 497.05 = 87.87 : x
  2. Step 2: Convert to fraction form
    331.35/497.05 = 87.87/x
  3. Step 3: Cross multiply
    331.35x = 497.05 × 87.87
  4. Step 4: Simplify right side
    331.35x = 43,673.70
  5. Step 5: Solve for x
    x = 43,673.70/331.35
  6. Step 6: Final answer
    x = 131.81

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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.