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Finding the Fourth Proportional to 18,686, 28,060.72 and 12,485.84

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Solution

The fourth proportional to 18,686, 28,060.72 and 12,485.84 is: 18,749.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686 : 28,060.72 = 12,485.84 : x
  2. Step 2: Convert to fraction form
    18,686/28,060.72 = 12,485.84/x
  3. Step 3: Cross multiply
    18,686x = 28,060.72 × 12,485.84
  4. Step 4: Simplify right side
    18,686x = 350,361,660.20
  5. Step 5: Solve for x
    x = 350,361,660.20/18,686
  6. Step 6: Final answer
    x = 18,749.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.