Home / 12,939.08-19,412.96-5,145.80

Finding the Fourth Proportional to 12,939.08, 19,412.96 and 5,145.80

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Solution

The fourth proportional to 12,939.08, 19,412.96 and 5,145.80 is: 7,720.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939.08 : 19,412.96 = 5,145.80 : x
  2. Step 2: Convert to fraction form
    12,939.08/19,412.96 = 5,145.80/x
  3. Step 3: Cross multiply
    12,939.08x = 19,412.96 × 5,145.80
  4. Step 4: Simplify right side
    12,939.08x = 99,895,209.57
  5. Step 5: Solve for x
    x = 99,895,209.57/12,939.08
  6. Step 6: Final answer
    x = 7,720.43

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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.