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Finding the Fourth Proportional to 139,345.50, 192,297.15 and 81,986.97

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Solution

The fourth proportional to 139,345.50, 192,297.15 and 81,986.97 is: 113,142.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,345.50 : 192,297.15 = 81,986.97 : x
  2. Step 2: Convert to fraction form
    139,345.50/192,297.15 = 81,986.97/x
  3. Step 3: Cross multiply
    139,345.50x = 192,297.15 × 81,986.97
  4. Step 4: Simplify right side
    139,345.50x = 15,765,860,668.14
  5. Step 5: Solve for x
    x = 15,765,860,668.14/139,345.50
  6. Step 6: Final answer
    x = 113,142.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.