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Finding the Fourth Proportional to 100,028.90, 138,034.78 and 54,698.09

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Solution

The fourth proportional to 100,028.90, 138,034.78 and 54,698.09 is: 75,480.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,028.90 : 138,034.78 = 54,698.09 : x
  2. Step 2: Convert to fraction form
    100,028.90/138,034.78 = 54,698.09/x
  3. Step 3: Cross multiply
    100,028.90x = 138,034.78 × 54,698.09
  4. Step 4: Simplify right side
    100,028.90x = 7,550,238,300.33
  5. Step 5: Solve for x
    x = 7,550,238,300.33/100,028.90
  6. Step 6: Final answer
    x = 75,480.57

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1.5x scale

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.