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Finding the Fourth Proportional to 28,155,978, 38,855,249.64 and 15,278,922

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Solution

The fourth proportional to 28,155,978, 38,855,249.64 and 15,278,922 is: 21,084,912.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,155,978 : 38,855,249.64 = 15,278,922 : x
  2. Step 2: Convert to fraction form
    28,155,978/38,855,249.64 = 15,278,922/x
  3. Step 3: Cross multiply
    28,155,978x = 38,855,249.64 × 15,278,922
  4. Step 4: Simplify right side
    28,155,978x = 593,666,328,540,088.12
  5. Step 5: Solve for x
    x = 593,666,328,540,088.12/28,155,978
  6. Step 6: Final answer
    x = 21,084,912.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.