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Finding the Fourth Proportional to 131.14, 180.90 and 89.74

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Solution

The fourth proportional to 131.14, 180.90 and 89.74 is: 123.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.14 : 180.90 = 89.74 : x
  2. Step 2: Convert to fraction form
    131.14/180.90 = 89.74/x
  3. Step 3: Cross multiply
    131.14x = 180.90 × 89.74
  4. Step 4: Simplify right side
    131.14x = 16,233.97
  5. Step 5: Solve for x
    x = 16,233.97/131.14
  6. Step 6: Final answer
    x = 123.79

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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.