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Finding the Third Proportional to 1.57 and 4.31

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Solution

The third proportional to 1.57 and 4.31 is: 11.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.57 : 4.31 = 4.31 : x
  2. Step 2: Convert to fraction form
    1.57/4.31 = 4.31/x
  3. Step 3: Cross multiply
    1.57x = 4.31 × 4.31
  4. Step 4: Simplify right side
    1.57x = 18.53
  5. Step 5: Solve for x
    x = 18.53/1.57
  6. Step 6: Final answer
    x = 11.84

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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.