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Finding the Fourth Proportional to 18,806.40, 25,957.80 and 11,728.68

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Solution

The fourth proportional to 18,806.40, 25,957.80 and 11,728.68 is: 16,188.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,806.40 : 25,957.80 = 11,728.68 : x
  2. Step 2: Convert to fraction form
    18,806.40/25,957.80 = 11,728.68/x
  3. Step 3: Cross multiply
    18,806.40x = 25,957.80 × 11,728.68
  4. Step 4: Simplify right side
    18,806.40x = 304,450,729.70
  5. Step 5: Solve for x
    x = 304,450,729.70/18,806.40
  6. Step 6: Final answer
    x = 16,188.68

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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.