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Finding the Fourth Proportional to 13,679.86, 18,877.87 and 7,711.52

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Solution

The fourth proportional to 13,679.86, 18,877.87 and 7,711.52 is: 10,641.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.86 : 18,877.87 = 7,711.52 : x
  2. Step 2: Convert to fraction form
    13,679.86/18,877.87 = 7,711.52/x
  3. Step 3: Cross multiply
    13,679.86x = 18,877.87 × 7,711.52
  4. Step 4: Simplify right side
    13,679.86x = 145,577,137.43
  5. Step 5: Solve for x
    x = 145,577,137.43/13,679.86
  6. Step 6: Final answer
    x = 10,641.72

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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.