Home / 139,372,974.40-209,087,367.60-78,049,341.28

Finding the Fourth Proportional to 139,372,974.40, 209,087,367.60 and 78,049,341.28

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Solution

The fourth proportional to 139,372,974.40, 209,087,367.60 and 78,049,341.28 is: 117,089,639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,372,974.40 : 209,087,367.60 = 78,049,341.28 : x
  2. Step 2: Convert to fraction form
    139,372,974.40/209,087,367.60 = 78,049,341.28/x
  3. Step 3: Cross multiply
    139,372,974.40x = 209,087,367.60 × 78,049,341.28
  4. Step 4: Simplify right side
    139,372,974.40x = 16,319,131,311,149,214
  5. Step 5: Solve for x
    x = 16,319,131,311,149,214/139,372,974.40
  6. Step 6: Final answer
    x = 117,089,639.38

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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.