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Finding the Fourth Proportional to 18,906.86, 28,360.29 and 5,055.50

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Solution

The fourth proportional to 18,906.86, 28,360.29 and 5,055.50 is: 7,583.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.86 : 28,360.29 = 5,055.50 : x
  2. Step 2: Convert to fraction form
    18,906.86/28,360.29 = 5,055.50/x
  3. Step 3: Cross multiply
    18,906.86x = 28,360.29 × 5,055.50
  4. Step 4: Simplify right side
    18,906.86x = 143,375,446.10
  5. Step 5: Solve for x
    x = 143,375,446.10/18,906.86
  6. Step 6: Final answer
    x = 7,583.25

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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.