Home / 81,079,039.28-121,618,558.80-20,494,765.28

Finding the Fourth Proportional to 81,079,039.28, 121,618,558.80 and 20,494,765.28

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Solution

The fourth proportional to 81,079,039.28, 121,618,558.80 and 20,494,765.28 is: 30,742,147.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,079,039.28 : 121,618,558.80 = 20,494,765.28 : x
  2. Step 2: Convert to fraction form
    81,079,039.28/121,618,558.80 = 20,494,765.28/x
  3. Step 3: Cross multiply
    81,079,039.28x = 121,618,558.80 × 20,494,765.28
  4. Step 4: Simplify right side
    81,079,039.28x = 2,492,543,816,297,878.50
  5. Step 5: Solve for x
    x = 2,492,543,816,297,878.50/81,079,039.28
  6. Step 6: Final answer
    x = 30,742,147.89

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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.