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Finding the Fourth Proportional to 431,736.80, 647,605.20 and 423,442.40

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Solution

The fourth proportional to 431,736.80, 647,605.20 and 423,442.40 is: 635,163.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,736.80 : 647,605.20 = 423,442.40 : x
  2. Step 2: Convert to fraction form
    431,736.80/647,605.20 = 423,442.40/x
  3. Step 3: Cross multiply
    431,736.80x = 647,605.20 × 423,442.40
  4. Step 4: Simplify right side
    431,736.80x = 274,223,500,140.48
  5. Step 5: Solve for x
    x = 274,223,500,140.48/431,736.80
  6. Step 6: Final answer
    x = 635,163.60

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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.