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Finding the Fourth Proportional to 139,980.60, 193,118.09 and 86,172.12

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Solution

The fourth proportional to 139,980.60, 193,118.09 and 86,172.12 is: 118,883.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,980.60 : 193,118.09 = 86,172.12 : x
  2. Step 2: Convert to fraction form
    139,980.60/193,118.09 = 86,172.12/x
  3. Step 3: Cross multiply
    139,980.60x = 193,118.09 × 86,172.12
  4. Step 4: Simplify right side
    139,980.60x = 16,641,394,794.79
  5. Step 5: Solve for x
    x = 16,641,394,794.79/139,980.60
  6. Step 6: Final answer
    x = 118,883.58

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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.