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Finding the Fourth Proportional to 139,316.56, 208,940.28 and 65,427.28

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Solution

The fourth proportional to 139,316.56, 208,940.28 and 65,427.28 is: 98,124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,316.56 : 208,940.28 = 65,427.28 : x
  2. Step 2: Convert to fraction form
    139,316.56/208,940.28 = 65,427.28/x
  3. Step 3: Cross multiply
    139,316.56x = 208,940.28 × 65,427.28
  4. Step 4: Simplify right side
    139,316.56x = 13,670,394,202.84
  5. Step 5: Solve for x
    x = 13,670,394,202.84/139,316.56
  6. Step 6: Final answer
    x = 98,124.69

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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.