Home / 78,515,890.26-117,764,824.92-21,012,647.28

Finding the Fourth Proportional to 78,515,890.26, 117,764,824.92 and 21,012,647.28

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Solution

The fourth proportional to 78,515,890.26, 117,764,824.92 and 21,012,647.28 is: 31,516,559.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,515,890.26 : 117,764,824.92 = 21,012,647.28 : x
  2. Step 2: Convert to fraction form
    78,515,890.26/117,764,824.92 = 21,012,647.28/x
  3. Step 3: Cross multiply
    78,515,890.26x = 117,764,824.92 × 21,012,647.28
  4. Step 4: Simplify right side
    78,515,890.26x = 2,474,550,728,034,914.50
  5. Step 5: Solve for x
    x = 2,474,550,728,034,914.50/78,515,890.26
  6. Step 6: Final answer
    x = 31,516,559.51

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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.