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Finding the Fourth Proportional to 131.21, 180.89 and 112.98

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Solution

The fourth proportional to 131.21, 180.89 and 112.98 is: 155.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.21 : 180.89 = 112.98 : x
  2. Step 2: Convert to fraction form
    131.21/180.89 = 112.98/x
  3. Step 3: Cross multiply
    131.21x = 180.89 × 112.98
  4. Step 4: Simplify right side
    131.21x = 20,436.95
  5. Step 5: Solve for x
    x = 20,436.95/131.21
  6. Step 6: Final answer
    x = 155.76

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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.