Home / 13,990.08-20,987.19-8,720.79

Finding the Fourth Proportional to 13,990.08, 20,987.19 and 8,720.79

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Solution

The fourth proportional to 13,990.08, 20,987.19 and 8,720.79 is: 13,082.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.08 : 20,987.19 = 8,720.79 : x
  2. Step 2: Convert to fraction form
    13,990.08/20,987.19 = 8,720.79/x
  3. Step 3: Cross multiply
    13,990.08x = 20,987.19 × 8,720.79
  4. Step 4: Simplify right side
    13,990.08x = 183,024,876.68
  5. Step 5: Solve for x
    x = 183,024,876.68/13,990.08
  6. Step 6: Final answer
    x = 13,082.48

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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.