Home / 18,668.79-27,987.21-8,130.78

Finding the Fourth Proportional to 18,668.79, 27,987.21 and 8,130.78

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Solution

The fourth proportional to 18,668.79, 27,987.21 and 8,130.78 is: 12,189.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,668.79 : 27,987.21 = 8,130.78 : x
  2. Step 2: Convert to fraction form
    18,668.79/27,987.21 = 8,130.78/x
  3. Step 3: Cross multiply
    18,668.79x = 27,987.21 × 8,130.78
  4. Step 4: Simplify right side
    18,668.79x = 227,557,847.32
  5. Step 5: Solve for x
    x = 227,557,847.32/18,668.79
  6. Step 6: Final answer
    x = 12,189.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.