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Finding the Fourth Proportional to 18,858.72, 28,291.86 and 7,172.04

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Solution

The fourth proportional to 18,858.72, 28,291.86 and 7,172.04 is: 10,759.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.72 : 28,291.86 = 7,172.04 : x
  2. Step 2: Convert to fraction form
    18,858.72/28,291.86 = 7,172.04/x
  3. Step 3: Cross multiply
    18,858.72x = 28,291.86 × 7,172.04
  4. Step 4: Simplify right side
    18,858.72x = 202,910,351.59
  5. Step 5: Solve for x
    x = 202,910,351.59/18,858.72
  6. Step 6: Final answer
    x = 10,759.50

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1.5x scale

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.