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Finding the Fourth Proportional to 393,149.70, 589,724.55 and 126,918.90

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Solution

The fourth proportional to 393,149.70, 589,724.55 and 126,918.90 is: 190,378.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,149.70 : 589,724.55 = 126,918.90 : x
  2. Step 2: Convert to fraction form
    393,149.70/589,724.55 = 126,918.90/x
  3. Step 3: Cross multiply
    393,149.70x = 589,724.55 × 126,918.90
  4. Step 4: Simplify right side
    393,149.70x = 74,847,191,189.00
  5. Step 5: Solve for x
    x = 74,847,191,189.00/393,149.70
  6. Step 6: Final answer
    x = 190,378.35

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Similar ratio
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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.