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Finding the Fourth Proportional to 18,851.47, 28,266.37 and 7,765.81

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Solution

The fourth proportional to 18,851.47, 28,266.37 and 7,765.81 is: 11,644.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,851.47 : 28,266.37 = 7,765.81 : x
  2. Step 2: Convert to fraction form
    18,851.47/28,266.37 = 7,765.81/x
  3. Step 3: Cross multiply
    18,851.47x = 28,266.37 × 7,765.81
  4. Step 4: Simplify right side
    18,851.47x = 219,511,168.73
  5. Step 5: Solve for x
    x = 219,511,168.73/18,851.47
  6. Step 6: Final answer
    x = 11,644.25

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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.