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Finding the Fourth Proportional to 722,123.72, 996,586.82 and 399,863.80

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Solution

The fourth proportional to 722,123.72, 996,586.82 and 399,863.80 is: 551,843.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,123.72 : 996,586.82 = 399,863.80 : x
  2. Step 2: Convert to fraction form
    722,123.72/996,586.82 = 399,863.80/x
  3. Step 3: Cross multiply
    722,123.72x = 996,586.82 × 399,863.80
  4. Step 4: Simplify right side
    722,123.72x = 398,498,992,875.12
  5. Step 5: Solve for x
    x = 398,498,992,875.12/722,123.72
  6. Step 6: Final answer
    x = 551,843.10

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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.