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Finding the Fourth Proportional to 121.74, 182.70 and 60.90

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Solution

The fourth proportional to 121.74, 182.70 and 60.90 is: 91.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.74 : 182.70 = 60.90 : x
  2. Step 2: Convert to fraction form
    121.74/182.70 = 60.90/x
  3. Step 3: Cross multiply
    121.74x = 182.70 × 60.90
  4. Step 4: Simplify right side
    121.74x = 11,126.43
  5. Step 5: Solve for x
    x = 11,126.43/121.74
  6. Step 6: Final answer
    x = 91.40

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.