Home / 21,911.56-30,236.34-12,479.80

Finding the Fourth Proportional to 21,911.56, 30,236.34 and 12,479.80

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Solution

The fourth proportional to 21,911.56, 30,236.34 and 12,479.80 is: 17,221.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.56 : 30,236.34 = 12,479.80 : x
  2. Step 2: Convert to fraction form
    21,911.56/30,236.34 = 12,479.80/x
  3. Step 3: Cross multiply
    21,911.56x = 30,236.34 × 12,479.80
  4. Step 4: Simplify right side
    21,911.56x = 377,343,475.93
  5. Step 5: Solve for x
    x = 377,343,475.93/21,911.56
  6. Step 6: Final answer
    x = 17,221.21

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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.