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Finding the Fourth Proportional to 121.42, 182.22 and 85.30

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Solution

The fourth proportional to 121.42, 182.22 and 85.30 is: 128.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.42 : 182.22 = 85.30 : x
  2. Step 2: Convert to fraction form
    121.42/182.22 = 85.30/x
  3. Step 3: Cross multiply
    121.42x = 182.22 × 85.30
  4. Step 4: Simplify right side
    121.42x = 15,543.37
  5. Step 5: Solve for x
    x = 15,543.37/121.42
  6. Step 6: Final answer
    x = 128.01

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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.