Home / 20,090.78-27,722.36-11,138.28

Finding the Fourth Proportional to 20,090.78, 27,722.36 and 11,138.28

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Solution

The fourth proportional to 20,090.78, 27,722.36 and 11,138.28 is: 15,369.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,090.78 : 27,722.36 = 11,138.28 : x
  2. Step 2: Convert to fraction form
    20,090.78/27,722.36 = 11,138.28/x
  3. Step 3: Cross multiply
    20,090.78x = 27,722.36 × 11,138.28
  4. Step 4: Simplify right side
    20,090.78x = 308,779,407.94
  5. Step 5: Solve for x
    x = 308,779,407.94/20,090.78
  6. Step 6: Final answer
    x = 15,369.21

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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.