Home / 20,781.36-28,692.36-15,126.48

Finding the Fourth Proportional to 20,781.36, 28,692.36 and 15,126.48

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Solution

The fourth proportional to 20,781.36, 28,692.36 and 15,126.48 is: 20,884.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,781.36 : 28,692.36 = 15,126.48 : x
  2. Step 2: Convert to fraction form
    20,781.36/28,692.36 = 15,126.48/x
  3. Step 3: Cross multiply
    20,781.36x = 28,692.36 × 15,126.48
  4. Step 4: Simplify right side
    20,781.36x = 434,014,409.69
  5. Step 5: Solve for x
    x = 434,014,409.69/20,781.36
  6. Step 6: Final answer
    x = 20,884.79

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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.