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Finding the Fourth Proportional to 13,879.15, 20,820.78 and 4,017.20

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Solution

The fourth proportional to 13,879.15, 20,820.78 and 4,017.20 is: 6,026.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,879.15 : 20,820.78 = 4,017.20 : x
  2. Step 2: Convert to fraction form
    13,879.15/20,820.78 = 4,017.20/x
  3. Step 3: Cross multiply
    13,879.15x = 20,820.78 × 4,017.20
  4. Step 4: Simplify right side
    13,879.15x = 83,641,133.31
  5. Step 5: Solve for x
    x = 83,641,133.31/13,879.15
  6. Step 6: Final answer
    x = 6,026.39

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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.