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Finding the Third Proportional to 47.81 and 70.31

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Solution

The third proportional to 47.81 and 70.31 is: 103.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.81 : 70.31 = 70.31 : x
  2. Step 2: Convert to fraction form
    47.81/70.31 = 70.31/x
  3. Step 3: Cross multiply
    47.81x = 70.31 × 70.31
  4. Step 4: Simplify right side
    47.81x = 4,943.85
  5. Step 5: Solve for x
    x = 4,943.85/47.81
  6. Step 6: Final answer
    x = 103.40

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.