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Finding the Fourth Proportional to 408,914.40, 613,371.60 and 128,431.20

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Solution

The fourth proportional to 408,914.40, 613,371.60 and 128,431.20 is: 192,646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,914.40 : 613,371.60 = 128,431.20 : x
  2. Step 2: Convert to fraction form
    408,914.40/613,371.60 = 128,431.20/x
  3. Step 3: Cross multiply
    408,914.40x = 613,371.60 × 128,431.20
  4. Step 4: Simplify right side
    408,914.40x = 78,776,050,633.92
  5. Step 5: Solve for x
    x = 78,776,050,633.92/408,914.40
  6. Step 6: Final answer
    x = 192,646.80

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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.