Home / 39,879.70-55,036.40-21,974.69

Finding the Fourth Proportional to 39,879.70, 55,036.40 and 21,974.69

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Solution

The fourth proportional to 39,879.70, 55,036.40 and 21,974.69 is: 30,326.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,879.70 : 55,036.40 = 21,974.69 : x
  2. Step 2: Convert to fraction form
    39,879.70/55,036.40 = 21,974.69/x
  3. Step 3: Cross multiply
    39,879.70x = 55,036.40 × 21,974.69
  4. Step 4: Simplify right side
    39,879.70x = 1,209,407,608.47
  5. Step 5: Solve for x
    x = 1,209,407,608.47/39,879.70
  6. Step 6: Final answer
    x = 30,326.40

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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.