Home / 100,107.12-138,145.98-54,784.20

Finding the Fourth Proportional to 100,107.12, 138,145.98 and 54,784.20

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Solution

The fourth proportional to 100,107.12, 138,145.98 and 54,784.20 is: 75,601.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,107.12 : 138,145.98 = 54,784.20 : x
  2. Step 2: Convert to fraction form
    100,107.12/138,145.98 = 54,784.20/x
  3. Step 3: Cross multiply
    100,107.12x = 138,145.98 × 54,784.20
  4. Step 4: Simplify right side
    100,107.12x = 7,568,216,306.79
  5. Step 5: Solve for x
    x = 7,568,216,306.79/100,107.12
  6. Step 6: Final answer
    x = 75,601.18

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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.