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Finding the Fourth Proportional to 13,711.88, 18,922.74 and 8,409.62

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Solution

The fourth proportional to 13,711.88, 18,922.74 and 8,409.62 is: 11,605.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,711.88 : 18,922.74 = 8,409.62 : x
  2. Step 2: Convert to fraction form
    13,711.88/18,922.74 = 8,409.62/x
  3. Step 3: Cross multiply
    13,711.88x = 18,922.74 × 8,409.62
  4. Step 4: Simplify right side
    13,711.88x = 159,133,052.76
  5. Step 5: Solve for x
    x = 159,133,052.76/13,711.88
  6. Step 6: Final answer
    x = 11,605.49

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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.