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Finding the Fourth Proportional to 331.34, 497.03 and 87.86

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Solution

The fourth proportional to 331.34, 497.03 and 87.86 is: 131.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.34 : 497.03 = 87.86 : x
  2. Step 2: Convert to fraction form
    331.34/497.03 = 87.86/x
  3. Step 3: Cross multiply
    331.34x = 497.03 × 87.86
  4. Step 4: Simplify right side
    331.34x = 43,669.06
  5. Step 5: Solve for x
    x = 43,669.06/331.34
  6. Step 6: Final answer
    x = 131.80

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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.