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Finding the Fourth Proportional to 122.16, 183.04 and 85.66

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Solution

The fourth proportional to 122.16, 183.04 and 85.66 is: 128.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.16 : 183.04 = 85.66 : x
  2. Step 2: Convert to fraction form
    122.16/183.04 = 85.66/x
  3. Step 3: Cross multiply
    122.16x = 183.04 × 85.66
  4. Step 4: Simplify right side
    122.16x = 15,679.21
  5. Step 5: Solve for x
    x = 15,679.21/122.16
  6. Step 6: Final answer
    x = 128.35

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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.