Home / 138,272.72-190,817.48-78,660.56

Finding the Fourth Proportional to 138,272.72, 190,817.48 and 78,660.56

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Solution

The fourth proportional to 138,272.72, 190,817.48 and 78,660.56 is: 108,552.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,272.72 : 190,817.48 = 78,660.56 : x
  2. Step 2: Convert to fraction form
    138,272.72/190,817.48 = 78,660.56/x
  3. Step 3: Cross multiply
    138,272.72x = 190,817.48 × 78,660.56
  4. Step 4: Simplify right side
    138,272.72x = 15,009,809,834.59
  5. Step 5: Solve for x
    x = 15,009,809,834.59/138,272.72
  6. Step 6: Final answer
    x = 108,552.21

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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.