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Finding the Fourth Proportional to 18,709.52, 28,064.28 and 5,561.87

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Solution

The fourth proportional to 18,709.52, 28,064.28 and 5,561.87 is: 8,342.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.52 : 28,064.28 = 5,561.87 : x
  2. Step 2: Convert to fraction form
    18,709.52/28,064.28 = 5,561.87/x
  3. Step 3: Cross multiply
    18,709.52x = 28,064.28 × 5,561.87
  4. Step 4: Simplify right side
    18,709.52x = 156,089,877.00
  5. Step 5: Solve for x
    x = 156,089,877.00/18,709.52
  6. Step 6: Final answer
    x = 8,342.81

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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.