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Finding the Fourth Proportional to 139,361.28, 208,842.66 and 111,366.48

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Solution

The fourth proportional to 139,361.28, 208,842.66 and 111,366.48 is: 166,890.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,361.28 : 208,842.66 = 111,366.48 : x
  2. Step 2: Convert to fraction form
    139,361.28/208,842.66 = 111,366.48/x
  3. Step 3: Cross multiply
    139,361.28x = 208,842.66 × 111,366.48
  4. Step 4: Simplify right side
    139,361.28x = 23,258,071,918.04
  5. Step 5: Solve for x
    x = 23,258,071,918.04/139,361.28
  6. Step 6: Final answer
    x = 166,890.49

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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.