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Finding the Fourth Proportional to 154.00, 231.05 and 85.66

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Solution

The fourth proportional to 154.00, 231.05 and 85.66 is: 128.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.00 : 231.05 = 85.66 : x
  2. Step 2: Convert to fraction form
    154.00/231.05 = 85.66/x
  3. Step 3: Cross multiply
    154.00x = 231.05 × 85.66
  4. Step 4: Simplify right side
    154.00x = 19,791.38
  5. Step 5: Solve for x
    x = 19,791.38/154.00
  6. Step 6: Final answer
    x = 128.51

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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.