Home / 20,388.72-28,142.40-13,316.22

Finding the Fourth Proportional to 20,388.72, 28,142.40 and 13,316.22

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Solution

The fourth proportional to 20,388.72, 28,142.40 and 13,316.22 is: 18,380.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.72 : 28,142.40 = 13,316.22 : x
  2. Step 2: Convert to fraction form
    20,388.72/28,142.40 = 13,316.22/x
  3. Step 3: Cross multiply
    20,388.72x = 28,142.40 × 13,316.22
  4. Step 4: Simplify right side
    20,388.72x = 374,750,389.73
  5. Step 5: Solve for x
    x = 374,750,389.73/20,388.72
  6. Step 6: Final answer
    x = 18,380.28

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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.