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Finding the Fourth Proportional to 100,388.88, 138,535.92 and 55,065.60

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Solution

The fourth proportional to 100,388.88, 138,535.92 and 55,065.60 is: 75,990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,388.88 : 138,535.92 = 55,065.60 : x
  2. Step 2: Convert to fraction form
    100,388.88/138,535.92 = 55,065.60/x
  3. Step 3: Cross multiply
    100,388.88x = 138,535.92 × 55,065.60
  4. Step 4: Simplify right side
    100,388.88x = 7,628,563,556.35
  5. Step 5: Solve for x
    x = 7,628,563,556.35/100,388.88
  6. Step 6: Final answer
    x = 75,990.13

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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.