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Finding the Fourth Proportional to 18,978,991.56, 28,477,162.32 and 10,330,135.56

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Solution

The fourth proportional to 18,978,991.56, 28,477,162.32 and 10,330,135.56 is: 15,499,925.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978,991.56 : 28,477,162.32 = 10,330,135.56 : x
  2. Step 2: Convert to fraction form
    18,978,991.56/28,477,162.32 = 10,330,135.56/x
  3. Step 3: Cross multiply
    18,978,991.56x = 28,477,162.32 × 10,330,135.56
  4. Step 4: Simplify right side
    18,978,991.56x = 294,172,947,129,724.12
  5. Step 5: Solve for x
    x = 294,172,947,129,724.12/18,978,991.56
  6. Step 6: Final answer
    x = 15,499,925.07

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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.