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Finding the Fourth Proportional to 139,626.40, 209,439.60 and 73,040.80

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Solution

The fourth proportional to 139,626.40, 209,439.60 and 73,040.80 is: 109,561.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,626.40 : 209,439.60 = 73,040.80 : x
  2. Step 2: Convert to fraction form
    139,626.40/209,439.60 = 73,040.80/x
  3. Step 3: Cross multiply
    139,626.40x = 209,439.60 × 73,040.80
  4. Step 4: Simplify right side
    139,626.40x = 15,297,635,935.68
  5. Step 5: Solve for x
    x = 15,297,635,935.68/139,626.40
  6. Step 6: Final answer
    x = 109,561.20

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1.5x scale

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.