Home / 20,381.28-28,126.28-11,889.28

Finding the Fourth Proportional to 20,381.28, 28,126.28 and 11,889.28

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Solution

The fourth proportional to 20,381.28, 28,126.28 and 11,889.28 is: 16,407.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.28 : 28,126.28 = 11,889.28 : x
  2. Step 2: Convert to fraction form
    20,381.28/28,126.28 = 11,889.28/x
  3. Step 3: Cross multiply
    20,381.28x = 28,126.28 × 11,889.28
  4. Step 4: Simplify right side
    20,381.28x = 334,401,218.28
  5. Step 5: Solve for x
    x = 334,401,218.28/20,381.28
  6. Step 6: Final answer
    x = 16,407.27

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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.