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Finding the Fourth Proportional to 647,959,145.42, 893,854,197.38 and 393,572,808.01

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Solution

The fourth proportional to 647,959,145.42, 893,854,197.38 and 393,572,808.01 is: 542,930,382.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,959,145.42 : 893,854,197.38 = 393,572,808.01 : x
  2. Step 2: Convert to fraction form
    647,959,145.42/893,854,197.38 = 393,572,808.01/x
  3. Step 3: Cross multiply
    647,959,145.42x = 893,854,197.38 × 393,572,808.01
  4. Step 4: Simplify right side
    647,959,145.42x = 351,796,706,414,371,392
  5. Step 5: Solve for x
    x = 351,796,706,414,371,392/647,959,145.42
  6. Step 6: Final answer
    x = 542,930,382.11

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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.