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Finding the Third Proportional to 154.69 and 247.31

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Solution

The third proportional to 154.69 and 247.31 is: 395.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.69 : 247.31 = 247.31 : x
  2. Step 2: Convert to fraction form
    154.69/247.31 = 247.31/x
  3. Step 3: Cross multiply
    154.69x = 247.31 × 247.31
  4. Step 4: Simplify right side
    154.69x = 61,163.47
  5. Step 5: Solve for x
    x = 61,163.47/154.69
  6. Step 6: Final answer
    x = 395.40

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.