Home / 81,678,661.20-122,368,692.60-66,450,142.80

Finding the Fourth Proportional to 81,678,661.20, 122,368,692.60 and 66,450,142.80

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Solution

The fourth proportional to 81,678,661.20, 122,368,692.60 and 66,450,142.80 is: 99,553,750.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,678,661.20 : 122,368,692.60 = 66,450,142.80 : x
  2. Step 2: Convert to fraction form
    81,678,661.20/122,368,692.60 = 66,450,142.80/x
  3. Step 3: Cross multiply
    81,678,661.20x = 122,368,692.60 × 66,450,142.80
  4. Step 4: Simplify right side
    81,678,661.20x = 8,131,417,097,519,303
  5. Step 5: Solve for x
    x = 8,131,417,097,519,303/81,678,661.20
  6. Step 6: Final answer
    x = 99,553,750.98

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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.