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Finding the Fourth Proportional to 643,481.43, 886,299.73 and 479,612.80

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Solution

The fourth proportional to 643,481.43, 886,299.73 and 479,612.80 is: 660,595.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,481.43 : 886,299.73 = 479,612.80 : x
  2. Step 2: Convert to fraction form
    643,481.43/886,299.73 = 479,612.80/x
  3. Step 3: Cross multiply
    643,481.43x = 886,299.73 × 479,612.80
  4. Step 4: Simplify right side
    643,481.43x = 425,080,695,144.54
  5. Step 5: Solve for x
    x = 425,080,695,144.54/643,481.43
  6. Step 6: Final answer
    x = 660,595.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.