Home / 13,778.28-20,667.81-3,390

Finding the Fourth Proportional to 13,778.28, 20,667.81 and 3,390

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Solution

The fourth proportional to 13,778.28, 20,667.81 and 3,390 is: 5,085.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,778.28 : 20,667.81 = 3,390 : x
  2. Step 2: Convert to fraction form
    13,778.28/20,667.81 = 3,390/x
  3. Step 3: Cross multiply
    13,778.28x = 20,667.81 × 3,390
  4. Step 4: Simplify right side
    13,778.28x = 70,063,875.90
  5. Step 5: Solve for x
    x = 70,063,875.90/13,778.28
  6. Step 6: Final answer
    x = 5,085.10

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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.