Home / 100,108.12-138,147.36-54,785.20

Finding the Fourth Proportional to 100,108.12, 138,147.36 and 54,785.20

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Solution

The fourth proportional to 100,108.12, 138,147.36 and 54,785.20 is: 75,602.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,108.12 : 138,147.36 = 54,785.20 : x
  2. Step 2: Convert to fraction form
    100,108.12/138,147.36 = 54,785.20/x
  3. Step 3: Cross multiply
    100,108.12x = 138,147.36 × 54,785.20
  4. Step 4: Simplify right side
    100,108.12x = 7,568,430,747.07
  5. Step 5: Solve for x
    x = 7,568,430,747.07/100,108.12
  6. Step 6: Final answer
    x = 75,602.57

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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.