Home / 13,778.60-20,667.96-3,390.32

Finding the Fourth Proportional to 13,778.60, 20,667.96 and 3,390.32

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Solution

The fourth proportional to 13,778.60, 20,667.96 and 3,390.32 is: 5,085.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,778.60 : 20,667.96 = 3,390.32 : x
  2. Step 2: Convert to fraction form
    13,778.60/20,667.96 = 3,390.32/x
  3. Step 3: Cross multiply
    13,778.60x = 20,667.96 × 3,390.32
  4. Step 4: Simplify right side
    13,778.60x = 70,070,998.15
  5. Step 5: Solve for x
    x = 70,070,998.15/13,778.60
  6. Step 6: Final answer
    x = 5,085.49

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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.