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Finding the Third Proportional to 0.81 and 1.20

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Solution

The third proportional to 0.81 and 1.20 is: 1.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.81 : 1.20 = 1.20 : x
  2. Step 2: Convert to fraction form
    0.81/1.20 = 1.20/x
  3. Step 3: Cross multiply
    0.81x = 1.20 × 1.20
  4. Step 4: Simplify right side
    0.81x = 1.43
  5. Step 5: Solve for x
    x = 1.43/0.81
  6. Step 6: Final answer
    x = 1.77

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.