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Finding the Third Proportional to 0.81 and 1.72

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Solution

The third proportional to 0.81 and 1.72 is: 3.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.81 : 1.72 = 1.72 : x
  2. Step 2: Convert to fraction form
    0.81/1.72 = 1.72/x
  3. Step 3: Cross multiply
    0.81x = 1.72 × 1.72
  4. Step 4: Simplify right side
    0.81x = 2.95
  5. Step 5: Solve for x
    x = 2.95/0.81
  6. Step 6: Final answer
    x = 3.64

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.