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Finding the Fourth Proportional to 139,241.76, 208,389.60 and 85,967.64

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Solution

The fourth proportional to 139,241.76, 208,389.60 and 85,967.64 is: 128,659.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,241.76 : 208,389.60 = 85,967.64 : x
  2. Step 2: Convert to fraction form
    139,241.76/208,389.60 = 85,967.64/x
  3. Step 3: Cross multiply
    139,241.76x = 208,389.60 × 85,967.64
  4. Step 4: Simplify right side
    139,241.76x = 17,914,762,112.54
  5. Step 5: Solve for x
    x = 17,914,762,112.54/139,241.76
  6. Step 6: Final answer
    x = 128,659.41

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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.