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Finding the Fourth Proportional to 139,969,163.70, 209,953,745.55 and 42,939,846.90

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Solution

The fourth proportional to 139,969,163.70, 209,953,745.55 and 42,939,846.90 is: 64,409,770.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,163.70 : 209,953,745.55 = 42,939,846.90 : x
  2. Step 2: Convert to fraction form
    139,969,163.70/209,953,745.55 = 42,939,846.90/x
  3. Step 3: Cross multiply
    139,969,163.70x = 209,953,745.55 × 42,939,846.90
  4. Step 4: Simplify right side
    139,969,163.70x = 9,015,381,689,998,556
  5. Step 5: Solve for x
    x = 9,015,381,689,998,556/139,969,163.70
  6. Step 6: Final answer
    x = 64,409,770.35

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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.