Home / 427,990.92-641,984.82-128,470.20

Finding the Fourth Proportional to 427,990.92, 641,984.82 and 128,470.20

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Solution

The fourth proportional to 427,990.92, 641,984.82 and 128,470.20 is: 192,704.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,990.92 : 641,984.82 = 128,470.20 : x
  2. Step 2: Convert to fraction form
    427,990.92/641,984.82 = 128,470.20/x
  3. Step 3: Cross multiply
    427,990.92x = 641,984.82 × 128,470.20
  4. Step 4: Simplify right side
    427,990.92x = 82,475,918,222.36
  5. Step 5: Solve for x
    x = 82,475,918,222.36/427,990.92
  6. Step 6: Final answer
    x = 192,704.83

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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.