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Finding the Fourth Proportional to 70,680.15, 106,015.05 and 20,764.16

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Solution

The fourth proportional to 70,680.15, 106,015.05 and 20,764.16 is: 31,144.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,680.15 : 106,015.05 = 20,764.16 : x
  2. Step 2: Convert to fraction form
    70,680.15/106,015.05 = 20,764.16/x
  3. Step 3: Cross multiply
    70,680.15x = 106,015.05 × 20,764.16
  4. Step 4: Simplify right side
    70,680.15x = 2,201,312,930.53
  5. Step 5: Solve for x
    x = 2,201,312,930.53/70,680.15
  6. Step 6: Final answer
    x = 31,144.71

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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.