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Finding the Fourth Proportional to 139,959,344.24, 193,143,978.20 and 78,079,682.87

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Solution

The fourth proportional to 139,959,344.24, 193,143,978.20 and 78,079,682.87 is: 107,750,008.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,959,344.24 : 193,143,978.20 = 78,079,682.87 : x
  2. Step 2: Convert to fraction form
    139,959,344.24/193,143,978.20 = 78,079,682.87/x
  3. Step 3: Cross multiply
    139,959,344.24x = 193,143,978.20 × 78,079,682.87
  4. Step 4: Simplify right side
    139,959,344.24x = 15,080,620,565,715,796
  5. Step 5: Solve for x
    x = 15,080,620,565,715,796/139,959,344.24
  6. Step 6: Final answer
    x = 107,750,008.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.