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Finding the Third Proportional to 247.78 and 531.56

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Solution

The third proportional to 247.78 and 531.56 is: 1,140.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.78 : 531.56 = 531.56 : x
  2. Step 2: Convert to fraction form
    247.78/531.56 = 531.56/x
  3. Step 3: Cross multiply
    247.78x = 531.56 × 531.56
  4. Step 4: Simplify right side
    247.78x = 282,558.69
  5. Step 5: Solve for x
    x = 282,558.69/247.78
  6. Step 6: Final answer
    x = 1,140.36

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.