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Finding the Fourth Proportional to 70,109.20, 105,163.80 and 54,362.80

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Solution

The fourth proportional to 70,109.20, 105,163.80 and 54,362.80 is: 81,544.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,109.20 : 105,163.80 = 54,362.80 : x
  2. Step 2: Convert to fraction form
    70,109.20/105,163.80 = 54,362.80/x
  3. Step 3: Cross multiply
    70,109.20x = 105,163.80 × 54,362.80
  4. Step 4: Simplify right side
    70,109.20x = 5,716,998,626.64
  5. Step 5: Solve for x
    x = 5,716,998,626.64/70,109.20
  6. Step 6: Final answer
    x = 81,544.20

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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.