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Finding the Fourth Proportional to 154.15, 231.19 and 72.95

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Solution

The fourth proportional to 154.15, 231.19 and 72.95 is: 109.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.15 : 231.19 = 72.95 : x
  2. Step 2: Convert to fraction form
    154.15/231.19 = 72.95/x
  3. Step 3: Cross multiply
    154.15x = 231.19 × 72.95
  4. Step 4: Simplify right side
    154.15x = 16,863.97
  5. Step 5: Solve for x
    x = 16,863.97/154.15
  6. Step 6: Final answer
    x = 109.40

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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.