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Finding the Fourth Proportional to 70,579.55, 105,883.10 and 20,660.46

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Solution

The fourth proportional to 70,579.55, 105,883.10 and 20,660.46 is: 30,994.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,579.55 : 105,883.10 = 20,660.46 : x
  2. Step 2: Convert to fraction form
    70,579.55/105,883.10 = 20,660.46/x
  3. Step 3: Cross multiply
    70,579.55x = 105,883.10 × 20,660.46
  4. Step 4: Simplify right side
    70,579.55x = 2,187,593,448.92
  5. Step 5: Solve for x
    x = 2,187,593,448.92/70,579.55
  6. Step 6: Final answer
    x = 30,994.72

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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.