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Finding the Fourth Proportional to 121.64, 182.52 and 85.86

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Solution

The fourth proportional to 121.64, 182.52 and 85.86 is: 128.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.64 : 182.52 = 85.86 : x
  2. Step 2: Convert to fraction form
    121.64/182.52 = 85.86/x
  3. Step 3: Cross multiply
    121.64x = 182.52 × 85.86
  4. Step 4: Simplify right side
    121.64x = 15,671.17
  5. Step 5: Solve for x
    x = 15,671.17/121.64
  6. Step 6: Final answer
    x = 128.84

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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.