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Finding the Fourth Proportional to 431,646.60, 647,413.20 and 132,157.20

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Solution

The fourth proportional to 431,646.60, 647,413.20 and 132,157.20 is: 198,218.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,646.60 : 647,413.20 = 132,157.20 : x
  2. Step 2: Convert to fraction form
    431,646.60/647,413.20 = 132,157.20/x
  3. Step 3: Cross multiply
    431,646.60x = 647,413.20 × 132,157.20
  4. Step 4: Simplify right side
    431,646.60x = 85,560,315,755.04
  5. Step 5: Solve for x
    x = 85,560,315,755.04/431,646.60
  6. Step 6: Final answer
    x = 198,218.44

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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.