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Finding the Fourth Proportional to 13,179.76, 18,188.12 and 7,211.48

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Solution

The fourth proportional to 13,179.76, 18,188.12 and 7,211.48 is: 9,951.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,179.76 : 18,188.12 = 7,211.48 : x
  2. Step 2: Convert to fraction form
    13,179.76/18,188.12 = 7,211.48/x
  3. Step 3: Cross multiply
    13,179.76x = 18,188.12 × 7,211.48
  4. Step 4: Simplify right side
    13,179.76x = 131,163,263.62
  5. Step 5: Solve for x
    x = 131,163,263.62/13,179.76
  6. Step 6: Final answer
    x = 9,951.87

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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.