Home / 12,780.60-19,169.32-3,421.32

Finding the Fourth Proportional to 12,780.60, 19,169.32 and 3,421.32

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Solution

The fourth proportional to 12,780.60, 19,169.32 and 3,421.32 is: 5,131.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780.60 : 19,169.32 = 3,421.32 : x
  2. Step 2: Convert to fraction form
    12,780.60/19,169.32 = 3,421.32/x
  3. Step 3: Cross multiply
    12,780.60x = 19,169.32 × 3,421.32
  4. Step 4: Simplify right side
    12,780.60x = 65,584,377.90
  5. Step 5: Solve for x
    x = 65,584,377.90/12,780.60
  6. Step 6: Final answer
    x = 5,131.56

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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.