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Finding the Fourth Proportional to 138,690.60, 208,035.90 and 122,620.20

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Solution

The fourth proportional to 138,690.60, 208,035.90 and 122,620.20 is: 183,930.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,690.60 : 208,035.90 = 122,620.20 : x
  2. Step 2: Convert to fraction form
    138,690.60/208,035.90 = 122,620.20/x
  3. Step 3: Cross multiply
    138,690.60x = 208,035.90 × 122,620.20
  4. Step 4: Simplify right side
    138,690.60x = 25,509,403,665.18
  5. Step 5: Solve for x
    x = 25,509,403,665.18/138,690.60
  6. Step 6: Final answer
    x = 183,930.30

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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.