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Finding the Fourth Proportional to 431,696.80, 647,545.20 and 305,725.60

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Solution

The fourth proportional to 431,696.80, 647,545.20 and 305,725.60 is: 458,588.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,696.80 : 647,545.20 = 305,725.60 : x
  2. Step 2: Convert to fraction form
    431,696.80/647,545.20 = 305,725.60/x
  3. Step 3: Cross multiply
    431,696.80x = 647,545.20 × 305,725.60
  4. Step 4: Simplify right side
    431,696.80x = 197,971,144,797.12
  5. Step 5: Solve for x
    x = 197,971,144,797.12/431,696.80
  6. Step 6: Final answer
    x = 458,588.40

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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.