Home / 20,401.72-28,128.54-13,316.92

Finding the Fourth Proportional to 20,401.72, 28,128.54 and 13,316.92

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Solution

The fourth proportional to 20,401.72, 28,128.54 and 13,316.92 is: 18,360.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,401.72 : 28,128.54 = 13,316.92 : x
  2. Step 2: Convert to fraction form
    20,401.72/28,128.54 = 13,316.92/x
  3. Step 3: Cross multiply
    20,401.72x = 28,128.54 × 13,316.92
  4. Step 4: Simplify right side
    20,401.72x = 374,585,516.90
  5. Step 5: Solve for x
    x = 374,585,516.90/20,401.72
  6. Step 6: Final answer
    x = 18,360.49

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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.