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Finding the Fourth Proportional to 154.08, 211.47 and 139.44

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Solution

The fourth proportional to 154.08, 211.47 and 139.44 is: 191.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.08 : 211.47 = 139.44 : x
  2. Step 2: Convert to fraction form
    154.08/211.47 = 139.44/x
  3. Step 3: Cross multiply
    154.08x = 211.47 × 139.44
  4. Step 4: Simplify right side
    154.08x = 29,487.38
  5. Step 5: Solve for x
    x = 29,487.38/154.08
  6. Step 6: Final answer
    x = 191.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.