Home / 21,771.36-30,042.18-12,818.28

Finding the Fourth Proportional to 21,771.36, 30,042.18 and 12,818.28

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Solution

The fourth proportional to 21,771.36, 30,042.18 and 12,818.28 is: 17,687.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,771.36 : 30,042.18 = 12,818.28 : x
  2. Step 2: Convert to fraction form
    21,771.36/30,042.18 = 12,818.28/x
  3. Step 3: Cross multiply
    21,771.36x = 30,042.18 × 12,818.28
  4. Step 4: Simplify right side
    21,771.36x = 385,089,075.05
  5. Step 5: Solve for x
    x = 385,089,075.05/21,771.36
  6. Step 6: Final answer
    x = 17,687.87

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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.