Home / 13,920.72-20,881.08-3,390.68

Finding the Fourth Proportional to 13,920.72, 20,881.08 and 3,390.68

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Solution

The fourth proportional to 13,920.72, 20,881.08 and 3,390.68 is: 5,086.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.72 : 20,881.08 = 3,390.68 : x
  2. Step 2: Convert to fraction form
    13,920.72/20,881.08 = 3,390.68/x
  3. Step 3: Cross multiply
    13,920.72x = 20,881.08 × 3,390.68
  4. Step 4: Simplify right side
    13,920.72x = 70,801,060.33
  5. Step 5: Solve for x
    x = 70,801,060.33/13,920.72
  6. Step 6: Final answer
    x = 5,086.02

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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.