Home / 20,561.85-28,368.43-13,388.49

Finding the Fourth Proportional to 20,561.85, 28,368.43 and 13,388.49

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Solution

The fourth proportional to 20,561.85, 28,368.43 and 13,388.49 is: 18,471.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.85 : 28,368.43 = 13,388.49 : x
  2. Step 2: Convert to fraction form
    20,561.85/28,368.43 = 13,388.49/x
  3. Step 3: Cross multiply
    20,561.85x = 28,368.43 × 13,388.49
  4. Step 4: Simplify right side
    20,561.85x = 379,810,407.90
  5. Step 5: Solve for x
    x = 379,810,407.90/20,561.85
  6. Step 6: Final answer
    x = 18,471.61

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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.