Home / 15,128.12-20,856.76-13,222.39

Finding the Fourth Proportional to 15,128.12, 20,856.76 and 13,222.39

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Solution

The fourth proportional to 15,128.12, 20,856.76 and 13,222.39 is: 18,229.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,128.12 : 20,856.76 = 13,222.39 : x
  2. Step 2: Convert to fraction form
    15,128.12/20,856.76 = 13,222.39/x
  3. Step 3: Cross multiply
    15,128.12x = 20,856.76 × 13,222.39
  4. Step 4: Simplify right side
    15,128.12x = 275,776,256.75
  5. Step 5: Solve for x
    x = 275,776,256.75/15,128.12
  6. Step 6: Final answer
    x = 18,229.38

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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.