Home / 20,421.88-30,579.34-13,379.74

Finding the Fourth Proportional to 20,421.88, 30,579.34 and 13,379.74

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Solution

The fourth proportional to 20,421.88, 30,579.34 and 13,379.74 is: 20,034.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.88 : 30,579.34 = 13,379.74 : x
  2. Step 2: Convert to fraction form
    20,421.88/30,579.34 = 13,379.74/x
  3. Step 3: Cross multiply
    20,421.88x = 30,579.34 × 13,379.74
  4. Step 4: Simplify right side
    20,421.88x = 409,143,618.57
  5. Step 5: Solve for x
    x = 409,143,618.57/20,421.88
  6. Step 6: Final answer
    x = 20,034.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.