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Finding the Fourth Proportional to 721,813.47, 996,111.44 and 399,553.62

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Solution

The fourth proportional to 721,813.47, 996,111.44 and 399,553.62 is: 551,388.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,813.47 : 996,111.44 = 399,553.62 : x
  2. Step 2: Convert to fraction form
    721,813.47/996,111.44 = 399,553.62/x
  3. Step 3: Cross multiply
    721,813.47x = 996,111.44 × 399,553.62
  4. Step 4: Simplify right side
    721,813.47x = 397,999,931,775.41
  5. Step 5: Solve for x
    x = 397,999,931,775.41/721,813.47
  6. Step 6: Final answer
    x = 551,388.90

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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.