Home / 20,655.88-28,509.23-13,111.20

Finding the Fourth Proportional to 20,655.88, 28,509.23 and 13,111.20

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Solution

The fourth proportional to 20,655.88, 28,509.23 and 13,111.20 is: 18,096.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,655.88 : 28,509.23 = 13,111.20 : x
  2. Step 2: Convert to fraction form
    20,655.88/28,509.23 = 13,111.20/x
  3. Step 3: Cross multiply
    20,655.88x = 28,509.23 × 13,111.20
  4. Step 4: Simplify right side
    20,655.88x = 373,790,249.15
  5. Step 5: Solve for x
    x = 373,790,249.15/20,655.88
  6. Step 6: Final answer
    x = 18,096.07

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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.