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Finding the Fourth Proportional to 70,855.79, 106,281.92 and 28,724.61

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Solution

The fourth proportional to 70,855.79, 106,281.92 and 28,724.61 is: 43,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,855.79 : 106,281.92 = 28,724.61 : x
  2. Step 2: Convert to fraction form
    70,855.79/106,281.92 = 28,724.61/x
  3. Step 3: Cross multiply
    70,855.79x = 106,281.92 × 28,724.61
  4. Step 4: Simplify right side
    70,855.79x = 3,052,906,558.43
  5. Step 5: Solve for x
    x = 3,052,906,558.43/70,855.79
  6. Step 6: Final answer
    x = 43,086.20

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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.