Home / 13,920.90-20,881.30-3,390.80

Finding the Fourth Proportional to 13,920.90, 20,881.30 and 3,390.80

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Solution

The fourth proportional to 13,920.90, 20,881.30 and 3,390.80 is: 5,086.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.90 : 20,881.30 = 3,390.80 : x
  2. Step 2: Convert to fraction form
    13,920.90/20,881.30 = 3,390.80/x
  3. Step 3: Cross multiply
    13,920.90x = 20,881.30 × 3,390.80
  4. Step 4: Simplify right side
    13,920.90x = 70,804,312.04
  5. Step 5: Solve for x
    x = 70,804,312.04/13,920.90
  6. Step 6: Final answer
    x = 5,086.19

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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.