Home / 100,456.07-138,628.94-55,134.78

Finding the Fourth Proportional to 100,456.07, 138,628.94 and 55,134.78

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Solution

The fourth proportional to 100,456.07, 138,628.94 and 55,134.78 is: 76,085.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,456.07 : 138,628.94 = 55,134.78 : x
  2. Step 2: Convert to fraction form
    100,456.07/138,628.94 = 55,134.78/x
  3. Step 3: Cross multiply
    100,456.07x = 138,628.94 × 55,134.78
  4. Step 4: Simplify right side
    100,456.07x = 7,643,275,313.00
  5. Step 5: Solve for x
    x = 7,643,275,313.00/100,456.07
  6. Step 6: Final answer
    x = 76,085.75

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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.