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Finding the Fourth Proportional to 131.21, 181.09 and 98.41

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Solution

The fourth proportional to 131.21, 181.09 and 98.41 is: 135.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.21 : 181.09 = 98.41 : x
  2. Step 2: Convert to fraction form
    131.21/181.09 = 98.41/x
  3. Step 3: Cross multiply
    131.21x = 181.09 × 98.41
  4. Step 4: Simplify right side
    131.21x = 17,820.43
  5. Step 5: Solve for x
    x = 17,820.43/131.21
  6. Step 6: Final answer
    x = 135.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.