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Finding the Fourth Proportional to 12,143.86, 16,759.90 and 6,839.16

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Solution

The fourth proportional to 12,143.86, 16,759.90 and 6,839.16 is: 9,438.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,143.86 : 16,759.90 = 6,839.16 : x
  2. Step 2: Convert to fraction form
    12,143.86/16,759.90 = 6,839.16/x
  3. Step 3: Cross multiply
    12,143.86x = 16,759.90 × 6,839.16
  4. Step 4: Simplify right side
    12,143.86x = 114,623,637.68
  5. Step 5: Solve for x
    x = 114,623,637.68/12,143.86
  6. Step 6: Final answer
    x = 9,438.81

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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.