Home / 20,680.51-28,523.81-13,120.32

Finding the Fourth Proportional to 20,680.51, 28,523.81 and 13,120.32

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Solution

The fourth proportional to 20,680.51, 28,523.81 and 13,120.32 is: 18,096.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.51 : 28,523.81 = 13,120.32 : x
  2. Step 2: Convert to fraction form
    20,680.51/28,523.81 = 13,120.32/x
  3. Step 3: Cross multiply
    20,680.51x = 28,523.81 × 13,120.32
  4. Step 4: Simplify right side
    20,680.51x = 374,241,514.82
  5. Step 5: Solve for x
    x = 374,241,514.82/20,680.51
  6. Step 6: Final answer
    x = 18,096.34

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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.