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Finding the Fourth Proportional to 431,759.80, 647,639.70 and 423,465.40

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Solution

The fourth proportional to 431,759.80, 647,639.70 and 423,465.40 is: 635,198.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,759.80 : 647,639.70 = 423,465.40 : x
  2. Step 2: Convert to fraction form
    431,759.80/647,639.70 = 423,465.40/x
  3. Step 3: Cross multiply
    431,759.80x = 647,639.70 × 423,465.40
  4. Step 4: Simplify right side
    431,759.80x = 274,253,004,616.38
  5. Step 5: Solve for x
    x = 274,253,004,616.38/431,759.80
  6. Step 6: Final answer
    x = 635,198.10

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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.