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Finding the Fourth Proportional to 21,191,353, 31,791,768 and 7,728,181

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Solution

The fourth proportional to 21,191,353, 31,791,768 and 7,728,181 is: 11,593,999.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,191,353 : 31,791,768 = 7,728,181 : x
  2. Step 2: Convert to fraction form
    21,191,353/31,791,768 = 7,728,181/x
  3. Step 3: Cross multiply
    21,191,353x = 31,791,768 × 7,728,181
  4. Step 4: Simplify right side
    21,191,353x = 245,692,537,414,008
  5. Step 5: Solve for x
    x = 245,692,537,414,008/21,191,353
  6. Step 6: Final answer
    x = 11,593,999.56

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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.