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Finding the Fourth Proportional to 21,201,139.80, 31,801,709.70 and 21,201,139.80

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Solution

The fourth proportional to 21,201,139.80, 31,801,709.70 and 21,201,139.80 is: 31,801,709.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,201,139.80 : 31,801,709.70 = 21,201,139.80 : x
  2. Step 2: Convert to fraction form
    21,201,139.80/31,801,709.70 = 21,201,139.80/x
  3. Step 3: Cross multiply
    21,201,139.80x = 31,801,709.70 × 21,201,139.80
  4. Step 4: Simplify right side
    21,201,139.80x = 674,232,493,228,716.12
  5. Step 5: Solve for x
    x = 674,232,493,228,716.12/21,201,139.80
  6. Step 6: Final answer
    x = 31,801,709.70

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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.