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Finding the Fourth Proportional to 12,391.60, 17,076.80 and 12,163.86

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Solution

The fourth proportional to 12,391.60, 17,076.80 and 12,163.86 is: 16,762.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,391.60 : 17,076.80 = 12,163.86 : x
  2. Step 2: Convert to fraction form
    12,391.60/17,076.80 = 12,163.86/x
  3. Step 3: Cross multiply
    12,391.60x = 17,076.80 × 12,163.86
  4. Step 4: Simplify right side
    12,391.60x = 207,719,804.45
  5. Step 5: Solve for x
    x = 207,719,804.45/12,391.60
  6. Step 6: Final answer
    x = 16,762.95

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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.