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Finding the Fourth Proportional to 70,712.01, 106,056.45 and 20,786.43

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Solution

The fourth proportional to 70,712.01, 106,056.45 and 20,786.43 is: 31,176.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,712.01 : 106,056.45 = 20,786.43 : x
  2. Step 2: Convert to fraction form
    70,712.01/106,056.45 = 20,786.43/x
  3. Step 3: Cross multiply
    70,712.01x = 106,056.45 × 20,786.43
  4. Step 4: Simplify right side
    70,712.01x = 2,204,534,973.97
  5. Step 5: Solve for x
    x = 2,204,534,973.97/70,712.01
  6. Step 6: Final answer
    x = 31,176.25

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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.