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Finding the Fourth Proportional to 66,691,172.84, 100,034,893.02 and 21,255,693.80

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Solution

The fourth proportional to 66,691,172.84, 100,034,893.02 and 21,255,693.80 is: 31,882,945.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,691,172.84 : 100,034,893.02 = 21,255,693.80 : x
  2. Step 2: Convert to fraction form
    66,691,172.84/100,034,893.02 = 21,255,693.80/x
  3. Step 3: Cross multiply
    66,691,172.84x = 100,034,893.02 × 21,255,693.80
  4. Step 4: Simplify right side
    66,691,172.84x = 2,126,311,055,348,877.25
  5. Step 5: Solve for x
    x = 2,126,311,055,348,877.25/66,691,172.84
  6. Step 6: Final answer
    x = 31,882,945.90

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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.