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Finding the Fourth Proportional to 139,768.80, 209,653.20 and 131,458.20

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Solution

The fourth proportional to 139,768.80, 209,653.20 and 131,458.20 is: 197,187.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,768.80 : 209,653.20 = 131,458.20 : x
  2. Step 2: Convert to fraction form
    139,768.80/209,653.20 = 131,458.20/x
  3. Step 3: Cross multiply
    139,768.80x = 209,653.20 × 131,458.20
  4. Step 4: Simplify right side
    139,768.80x = 27,560,632,296.24
  5. Step 5: Solve for x
    x = 27,560,632,296.24/139,768.80
  6. Step 6: Final answer
    x = 197,187.30

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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.