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Finding the Fourth Proportional to 409,028.80, 613,562.40 and 128,555.20

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Solution

The fourth proportional to 409,028.80, 613,562.40 and 128,555.20 is: 192,838.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,028.80 : 613,562.40 = 128,555.20 : x
  2. Step 2: Convert to fraction form
    409,028.80/613,562.40 = 128,555.20/x
  3. Step 3: Cross multiply
    409,028.80x = 613,562.40 × 128,555.20
  4. Step 4: Simplify right side
    409,028.80x = 78,876,637,044.48
  5. Step 5: Solve for x
    x = 78,876,637,044.48/409,028.80
  6. Step 6: Final answer
    x = 192,838.83

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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.