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Finding the Third Proportional to 4.47 and 9.78

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Solution

The third proportional to 4.47 and 9.78 is: 21.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.47 : 9.78 = 9.78 : x
  2. Step 2: Convert to fraction form
    4.47/9.78 = 9.78/x
  3. Step 3: Cross multiply
    4.47x = 9.78 × 9.78
  4. Step 4: Simplify right side
    4.47x = 95.67
  5. Step 5: Solve for x
    x = 95.67/4.47
  6. Step 6: Final answer
    x = 21.41

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.