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Finding the Fourth Proportional to 18,906.61, 28,359.92 and 5,055.25

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Solution

The fourth proportional to 18,906.61, 28,359.92 and 5,055.25 is: 7,582.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.61 : 28,359.92 = 5,055.25 : x
  2. Step 2: Convert to fraction form
    18,906.61/28,359.92 = 5,055.25/x
  3. Step 3: Cross multiply
    18,906.61x = 28,359.92 × 5,055.25
  4. Step 4: Simplify right side
    18,906.61x = 143,366,460.30
  5. Step 5: Solve for x
    x = 143,366,460.30/18,906.61
  6. Step 6: Final answer
    x = 7,582.88

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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.