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Finding the Fourth Proportional to 70,940.08, 106,410.50 and 21,020.61

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Solution

The fourth proportional to 70,940.08, 106,410.50 and 21,020.61 is: 31,531.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,940.08 : 106,410.50 = 21,020.61 : x
  2. Step 2: Convert to fraction form
    70,940.08/106,410.50 = 21,020.61/x
  3. Step 3: Cross multiply
    70,940.08x = 106,410.50 × 21,020.61
  4. Step 4: Simplify right side
    70,940.08x = 2,236,813,373.68
  5. Step 5: Solve for x
    x = 2,236,813,373.68/70,940.08
  6. Step 6: Final answer
    x = 31,531.02

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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.