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Finding the Fourth Proportional to 431,163.60, 646,745.40 and 221,211.60

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Solution

The fourth proportional to 431,163.60, 646,745.40 and 221,211.60 is: 331,817.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,163.60 : 646,745.40 = 221,211.60 : x
  2. Step 2: Convert to fraction form
    431,163.60/646,745.40 = 221,211.60/x
  3. Step 3: Cross multiply
    431,163.60x = 646,745.40 × 221,211.60
  4. Step 4: Simplify right side
    431,163.60x = 143,067,584,726.64
  5. Step 5: Solve for x
    x = 143,067,584,726.64/431,163.60
  6. Step 6: Final answer
    x = 331,817.40

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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.