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Finding the Fourth Proportional to 486,425.80, 729,638.70 and 131,429.80

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Solution

The fourth proportional to 486,425.80, 729,638.70 and 131,429.80 is: 197,144.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,425.80 : 729,638.70 = 131,429.80 : x
  2. Step 2: Convert to fraction form
    486,425.80/729,638.70 = 131,429.80/x
  3. Step 3: Cross multiply
    486,425.80x = 729,638.70 × 131,429.80
  4. Step 4: Simplify right side
    486,425.80x = 95,896,268,413.26
  5. Step 5: Solve for x
    x = 95,896,268,413.26/486,425.80
  6. Step 6: Final answer
    x = 197,144.70

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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.