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Finding the Fourth Proportional to 154.13, 231.08 and 85.64

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Solution

The fourth proportional to 154.13, 231.08 and 85.64 is: 128.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.13 : 231.08 = 85.64 : x
  2. Step 2: Convert to fraction form
    154.13/231.08 = 85.64/x
  3. Step 3: Cross multiply
    154.13x = 231.08 × 85.64
  4. Step 4: Simplify right side
    154.13x = 19,788.11
  5. Step 5: Solve for x
    x = 19,788.11/154.13
  6. Step 6: Final answer
    x = 128.39

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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.