Home / 20,479.09-28,260.63-13,405.36

Finding the Fourth Proportional to 20,479.09, 28,260.63 and 13,405.36

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Solution

The fourth proportional to 20,479.09, 28,260.63 and 13,405.36 is: 18,499.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.09 : 28,260.63 = 13,405.36 : x
  2. Step 2: Convert to fraction form
    20,479.09/28,260.63 = 13,405.36/x
  3. Step 3: Cross multiply
    20,479.09x = 28,260.63 × 13,405.36
  4. Step 4: Simplify right side
    20,479.09x = 378,843,918.98
  5. Step 5: Solve for x
    x = 378,843,918.98/20,479.09
  6. Step 6: Final answer
    x = 18,499.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.