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Finding the Fourth Proportional to 393,019.20, 589,237.20 and 126,626.40

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Solution

The fourth proportional to 393,019.20, 589,237.20 and 126,626.40 is: 189,845.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,019.20 : 589,237.20 = 126,626.40 : x
  2. Step 2: Convert to fraction form
    393,019.20/589,237.20 = 126,626.40/x
  3. Step 3: Cross multiply
    393,019.20x = 589,237.20 × 126,626.40
  4. Step 4: Simplify right side
    393,019.20x = 74,612,985,382.08
  5. Step 5: Solve for x
    x = 74,612,985,382.08/393,019.20
  6. Step 6: Final answer
    x = 189,845.65

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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.