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Finding the Fourth Proportional to 128,647.80, 192,986.10 and 39,900.60

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Solution

The fourth proportional to 128,647.80, 192,986.10 and 39,900.60 is: 59,855.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,647.80 : 192,986.10 = 39,900.60 : x
  2. Step 2: Convert to fraction form
    128,647.80/192,986.10 = 39,900.60/x
  3. Step 3: Cross multiply
    128,647.80x = 192,986.10 × 39,900.60
  4. Step 4: Simplify right side
    128,647.80x = 7,700,261,181.66
  5. Step 5: Solve for x
    x = 7,700,261,181.66/128,647.80
  6. Step 6: Final answer
    x = 59,855.37

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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.