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Finding the Third Proportional to 0.42 and 0.90

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Solution

The third proportional to 0.42 and 0.90 is: 1.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    0.42 : 0.90 = 0.90 : x
  2. Step 2: Convert to fraction form
    0.42/0.90 = 0.90/x
  3. Step 3: Cross multiply
    0.42x = 0.90 × 0.90
  4. Step 4: Simplify right side
    0.42x = 0.80
  5. Step 5: Solve for x
    x = 0.80/0.42
  6. Step 6: Final answer
    x = 1.91

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.