Home / 20,900.31-28,879.80-15,544.38

Finding the Fourth Proportional to 20,900.31, 28,879.80 and 15,544.38

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Solution

The fourth proportional to 20,900.31, 28,879.80 and 15,544.38 is: 21,479.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.31 : 28,879.80 = 15,544.38 : x
  2. Step 2: Convert to fraction form
    20,900.31/28,879.80 = 15,544.38/x
  3. Step 3: Cross multiply
    20,900.31x = 28,879.80 × 15,544.38
  4. Step 4: Simplify right side
    20,900.31x = 448,918,585.52
  5. Step 5: Solve for x
    x = 448,918,585.52/20,900.31
  6. Step 6: Final answer
    x = 21,479.04

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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.