Home / 13,979.12-20,965.32-4,115.72

Finding the Fourth Proportional to 13,979.12, 20,965.32 and 4,115.72

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Solution

The fourth proportional to 13,979.12, 20,965.32 and 4,115.72 is: 6,172.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.12 : 20,965.32 = 4,115.72 : x
  2. Step 2: Convert to fraction form
    13,979.12/20,965.32 = 4,115.72/x
  3. Step 3: Cross multiply
    13,979.12x = 20,965.32 × 4,115.72
  4. Step 4: Simplify right side
    13,979.12x = 86,287,386.83
  5. Step 5: Solve for x
    x = 86,287,386.83/13,979.12
  6. Step 6: Final answer
    x = 6,172.59

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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.