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Finding the Fourth Proportional to 139,620.45, 207,851.54 and 138,790.08

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Solution

The fourth proportional to 139,620.45, 207,851.54 and 138,790.08 is: 206,615.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,620.45 : 207,851.54 = 138,790.08 : x
  2. Step 2: Convert to fraction form
    139,620.45/207,851.54 = 138,790.08/x
  3. Step 3: Cross multiply
    139,620.45x = 207,851.54 × 138,790.08
  4. Step 4: Simplify right side
    139,620.45x = 28,847,731,170.77
  5. Step 5: Solve for x
    x = 28,847,731,170.77/139,620.45
  6. Step 6: Final answer
    x = 206,615.37

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.