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Finding the Fourth Proportional to 431,696.80, 647,545.20 and 265,578.40

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Solution

The fourth proportional to 431,696.80, 647,545.20 and 265,578.40 is: 398,367.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,696.80 : 647,545.20 = 265,578.40 : x
  2. Step 2: Convert to fraction form
    431,696.80/647,545.20 = 265,578.40/x
  3. Step 3: Cross multiply
    431,696.80x = 647,545.20 × 265,578.40
  4. Step 4: Simplify right side
    431,696.80x = 171,974,018,143.68
  5. Step 5: Solve for x
    x = 171,974,018,143.68/431,696.80
  6. Step 6: Final answer
    x = 398,367.60

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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.