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Finding the Fourth Proportional to 3,387,985.82, 5,081,978.58 and 991,830.44

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Solution

The fourth proportional to 3,387,985.82, 5,081,978.58 and 991,830.44 is: 1,487,745.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,387,985.82 : 5,081,978.58 = 991,830.44 : x
  2. Step 2: Convert to fraction form
    3,387,985.82/5,081,978.58 = 991,830.44/x
  3. Step 3: Cross multiply
    3,387,985.82x = 5,081,978.58 × 991,830.44
  4. Step 4: Simplify right side
    3,387,985.82x = 5,040,461,037,050.47
  5. Step 5: Solve for x
    x = 5,040,461,037,050.47/3,387,985.82
  6. Step 6: Final answer
    x = 1,487,745.61

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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.