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Finding the Fourth Proportional to 386,039.80, 579,137.09 and 133,329.55

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Solution

The fourth proportional to 386,039.80, 579,137.09 and 133,329.55 is: 200,021.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,039.80 : 579,137.09 = 133,329.55 : x
  2. Step 2: Convert to fraction form
    386,039.80/579,137.09 = 133,329.55/x
  3. Step 3: Cross multiply
    386,039.80x = 579,137.09 × 133,329.55
  4. Step 4: Simplify right side
    386,039.80x = 77,216,086,931.36
  5. Step 5: Solve for x
    x = 77,216,086,931.36/386,039.80
  6. Step 6: Final answer
    x = 200,021.05

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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.