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Finding the Fourth Proportional to 18,704.40, 28,071.90 and 18,558.60

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Solution

The fourth proportional to 18,704.40, 28,071.90 and 18,558.60 is: 27,853.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,704.40 : 28,071.90 = 18,558.60 : x
  2. Step 2: Convert to fraction form
    18,704.40/28,071.90 = 18,558.60/x
  3. Step 3: Cross multiply
    18,704.40x = 28,071.90 × 18,558.60
  4. Step 4: Simplify right side
    18,704.40x = 520,975,163.34
  5. Step 5: Solve for x
    x = 520,975,163.34/18,704.40
  6. Step 6: Final answer
    x = 27,853.08

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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.