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Finding the Fourth Proportional to 81,395,207.40, 122,092,811.10 and 20,807,725.80

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Solution

The fourth proportional to 81,395,207.40, 122,092,811.10 and 20,807,725.80 is: 31,211,588.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,395,207.40 : 122,092,811.10 = 20,807,725.80 : x
  2. Step 2: Convert to fraction form
    81,395,207.40/122,092,811.10 = 20,807,725.80/x
  3. Step 3: Cross multiply
    81,395,207.40x = 122,092,811.10 × 20,807,725.80
  4. Step 4: Simplify right side
    81,395,207.40x = 2,540,473,735,519,996.50
  5. Step 5: Solve for x
    x = 2,540,473,735,519,996.50/81,395,207.40
  6. Step 6: Final answer
    x = 31,211,588.70

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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.