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Finding the Fourth Proportional to 154.10, 231.16 and 85.66

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Solution

The fourth proportional to 154.10, 231.16 and 85.66 is: 128.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.10 : 231.16 = 85.66 : x
  2. Step 2: Convert to fraction form
    154.10/231.16 = 85.66/x
  3. Step 3: Cross multiply
    154.10x = 231.16 × 85.66
  4. Step 4: Simplify right side
    154.10x = 19,801.17
  5. Step 5: Solve for x
    x = 19,801.17/154.10
  6. Step 6: Final answer
    x = 128.50

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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.