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Finding the Fourth Proportional to 139,425.10, 208,906.80 and 80,157.40

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Solution

The fourth proportional to 139,425.10, 208,906.80 and 80,157.40 is: 120,103.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,425.10 : 208,906.80 = 80,157.40 : x
  2. Step 2: Convert to fraction form
    139,425.10/208,906.80 = 80,157.40/x
  3. Step 3: Cross multiply
    139,425.10x = 208,906.80 × 80,157.40
  4. Step 4: Simplify right side
    139,425.10x = 16,745,425,930.32
  5. Step 5: Solve for x
    x = 16,745,425,930.32/139,425.10
  6. Step 6: Final answer
    x = 120,103.38

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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.