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Finding the Fourth Proportional to 431,690.20, 647,276.10 and 221,738.20

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Solution

The fourth proportional to 431,690.20, 647,276.10 and 221,738.20 is: 332,474.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,690.20 : 647,276.10 = 221,738.20 : x
  2. Step 2: Convert to fraction form
    431,690.20/647,276.10 = 221,738.20/x
  3. Step 3: Cross multiply
    431,690.20x = 647,276.10 × 221,738.20
  4. Step 4: Simplify right side
    431,690.20x = 143,525,837,317.02
  5. Step 5: Solve for x
    x = 143,525,837,317.02/431,690.20
  6. Step 6: Final answer
    x = 332,474.16

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1.5x scale

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.