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Finding the Fourth Proportional to 21,191,351, 31,791,765 and 7,728,179

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Solution

The fourth proportional to 21,191,351, 31,791,765 and 7,728,179 is: 11,593,996.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,191,351 : 31,791,765 = 7,728,179 : x
  2. Step 2: Convert to fraction form
    21,191,351/31,791,765 = 7,728,179/x
  3. Step 3: Cross multiply
    21,191,351x = 31,791,765 × 7,728,179
  4. Step 4: Simplify right side
    21,191,351x = 245,692,450,645,935
  5. Step 5: Solve for x
    x = 245,692,450,645,935/21,191,351
  6. Step 6: Final answer
    x = 11,593,996.56

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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.