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Finding the Fourth Proportional to 154.89, 231.75 and 139.72

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Solution

The fourth proportional to 154.89, 231.75 and 139.72 is: 209.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.89 : 231.75 = 139.72 : x
  2. Step 2: Convert to fraction form
    154.89/231.75 = 139.72/x
  3. Step 3: Cross multiply
    154.89x = 231.75 × 139.72
  4. Step 4: Simplify right side
    154.89x = 32,380.11
  5. Step 5: Solve for x
    x = 32,380.11/154.89
  6. Step 6: Final answer
    x = 209.05

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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.