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Finding the Fourth Proportional to 18,978,458.66, 28,440,426.62 and 10,787,609.06

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Solution

The fourth proportional to 18,978,458.66, 28,440,426.62 and 10,787,609.06 is: 16,165,917.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978,458.66 : 28,440,426.62 = 10,787,609.06 : x
  2. Step 2: Convert to fraction form
    18,978,458.66/28,440,426.62 = 10,787,609.06/x
  3. Step 3: Cross multiply
    18,978,458.66x = 28,440,426.62 × 10,787,609.06
  4. Step 4: Simplify right side
    18,978,458.66x = 306,804,203,876,177.19
  5. Step 5: Solve for x
    x = 306,804,203,876,177.19/18,978,458.66
  6. Step 6: Final answer
    x = 16,165,917.86

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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.