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Finding the Fourth Proportional to 409,021.80, 613,551.90 and 128,548.20

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Solution

The fourth proportional to 409,021.80, 613,551.90 and 128,548.20 is: 192,828.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,021.80 : 613,551.90 = 128,548.20 : x
  2. Step 2: Convert to fraction form
    409,021.80/613,551.90 = 128,548.20/x
  3. Step 3: Cross multiply
    409,021.80x = 613,551.90 × 128,548.20
  4. Step 4: Simplify right side
    409,021.80x = 78,870,992,351.58
  5. Step 5: Solve for x
    x = 78,870,992,351.58/409,021.80
  6. Step 6: Final answer
    x = 192,828.33

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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.