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Finding the Fourth Proportional to 21,261,646.60, 31,892,469.90 and 21,261,646.60

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Solution

The fourth proportional to 21,261,646.60, 31,892,469.90 and 21,261,646.60 is: 31,892,469.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,261,646.60 : 31,892,469.90 = 21,261,646.60 : x
  2. Step 2: Convert to fraction form
    21,261,646.60/31,892,469.90 = 21,261,646.60/x
  3. Step 3: Cross multiply
    21,261,646.60x = 31,892,469.90 × 21,261,646.60
  4. Step 4: Simplify right side
    21,261,646.60x = 678,086,424,214,937.38
  5. Step 5: Solve for x
    x = 678,086,424,214,937.38/21,261,646.60
  6. Step 6: Final answer
    x = 31,892,469.90

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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.