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Finding the Fourth Proportional to 139,968,163.80, 209,952,245.70 and 132,031,978.20

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Solution

The fourth proportional to 139,968,163.80, 209,952,245.70 and 132,031,978.20 is: 198,047,967.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,163.80 : 209,952,245.70 = 132,031,978.20 : x
  2. Step 2: Convert to fraction form
    139,968,163.80/209,952,245.70 = 132,031,978.20/x
  3. Step 3: Cross multiply
    139,968,163.80x = 209,952,245.70 × 132,031,978.20
  4. Step 4: Simplify right side
    139,968,163.80x = 27,720,410,327,303,444
  5. Step 5: Solve for x
    x = 27,720,410,327,303,444/139,968,163.80
  6. Step 6: Final answer
    x = 198,047,967.30

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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.