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Finding the Third Proportional to 1.28 and 1.51

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Solution

The third proportional to 1.28 and 1.51 is: 1.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.28 : 1.51 = 1.51 : x
  2. Step 2: Convert to fraction form
    1.28/1.51 = 1.51/x
  3. Step 3: Cross multiply
    1.28x = 1.51 × 1.51
  4. Step 4: Simplify right side
    1.28x = 2.28
  5. Step 5: Solve for x
    x = 2.28/1.28
  6. Step 6: Final answer
    x = 1.78

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.