Home / 20,478.85-28,249.74-13,684.57

Finding the Fourth Proportional to 20,478.85, 28,249.74 and 13,684.57

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Solution

The fourth proportional to 20,478.85, 28,249.74 and 13,684.57 is: 18,877.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.85 : 28,249.74 = 13,684.57 : x
  2. Step 2: Convert to fraction form
    20,478.85/28,249.74 = 13,684.57/x
  3. Step 3: Cross multiply
    20,478.85x = 28,249.74 × 13,684.57
  4. Step 4: Simplify right side
    20,478.85x = 386,585,544.51
  5. Step 5: Solve for x
    x = 386,585,544.51/20,478.85
  6. Step 6: Final answer
    x = 18,877.31

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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.