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Finding the Fourth Proportional to 100,372.54, 138,514.09 and 55,660.54

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Solution

The fourth proportional to 100,372.54, 138,514.09 and 55,660.54 is: 76,811.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,372.54 : 138,514.09 = 55,660.54 : x
  2. Step 2: Convert to fraction form
    100,372.54/138,514.09 = 55,660.54/x
  3. Step 3: Cross multiply
    100,372.54x = 138,514.09 × 55,660.54
  4. Step 4: Simplify right side
    100,372.54x = 7,709,769,047.01
  5. Step 5: Solve for x
    x = 7,709,769,047.01/100,372.54
  6. Step 6: Final answer
    x = 76,811.54

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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.