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Finding the Fourth Proportional to 70,613.81, 105,906.35 and 20,680.49

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Solution

The fourth proportional to 70,613.81, 105,906.35 and 20,680.49 is: 31,016.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,613.81 : 105,906.35 = 20,680.49 : x
  2. Step 2: Convert to fraction form
    70,613.81/105,906.35 = 20,680.49/x
  3. Step 3: Cross multiply
    70,613.81x = 105,906.35 × 20,680.49
  4. Step 4: Simplify right side
    70,613.81x = 2,190,195,108.71
  5. Step 5: Solve for x
    x = 2,190,195,108.71/70,613.81
  6. Step 6: Final answer
    x = 31,016.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.