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Finding the Third Proportional to 5.79 and 15.91

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Solution

The third proportional to 5.79 and 15.91 is: 43.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.79 : 15.91 = 15.91 : x
  2. Step 2: Convert to fraction form
    5.79/15.91 = 15.91/x
  3. Step 3: Cross multiply
    5.79x = 15.91 × 15.91
  4. Step 4: Simplify right side
    5.79x = 253.10
  5. Step 5: Solve for x
    x = 253.10/5.79
  6. Step 6: Final answer
    x = 43.75

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Why These Related Problems?

These problems maintain the same ratio (2.75) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.