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Finding the Fourth Proportional to 18,721,638.80, 28,040,467.80 and 15,362,406.80

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Solution

The fourth proportional to 18,721,638.80, 28,040,467.80 and 15,362,406.80 is: 23,009,154.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721,638.80 : 28,040,467.80 = 15,362,406.80 : x
  2. Step 2: Convert to fraction form
    18,721,638.80/28,040,467.80 = 15,362,406.80/x
  3. Step 3: Cross multiply
    18,721,638.80x = 28,040,467.80 × 15,362,406.80
  4. Step 4: Simplify right side
    18,721,638.80x = 430,769,073,205,901.06
  5. Step 5: Solve for x
    x = 430,769,073,205,901.06/18,721,638.80
  6. Step 6: Final answer
    x = 23,009,154.16

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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.