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Finding the Fourth Proportional to 386,578.48, 579,728.78 and 133,790.40

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Solution

The fourth proportional to 386,578.48, 579,728.78 and 133,790.40 is: 200,637.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,578.48 : 579,728.78 = 133,790.40 : x
  2. Step 2: Convert to fraction form
    386,578.48/579,728.78 = 133,790.40/x
  3. Step 3: Cross multiply
    386,578.48x = 579,728.78 × 133,790.40
  4. Step 4: Simplify right side
    386,578.48x = 77,562,145,367.71
  5. Step 5: Solve for x
    x = 77,562,145,367.71/386,578.48
  6. Step 6: Final answer
    x = 200,637.51

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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.