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Finding the Fourth Proportional to 427,990.40, 641,984.08 and 128,469.68

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Solution

The fourth proportional to 427,990.40, 641,984.08 and 128,469.68 is: 192,704.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,990.40 : 641,984.08 = 128,469.68 : x
  2. Step 2: Convert to fraction form
    427,990.40/641,984.08 = 128,469.68/x
  3. Step 3: Cross multiply
    427,990.40x = 641,984.08 × 128,469.68
  4. Step 4: Simplify right side
    427,990.40x = 82,475,489,322.69
  5. Step 5: Solve for x
    x = 82,475,489,322.69/427,990.40
  6. Step 6: Final answer
    x = 192,704.06

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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.