Home / 21,879.75-30,192.24-12,320.51

Finding the Fourth Proportional to 21,879.75, 30,192.24 and 12,320.51

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Solution

The fourth proportional to 21,879.75, 30,192.24 and 12,320.51 is: 17,001.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.75 : 30,192.24 = 12,320.51 : x
  2. Step 2: Convert to fraction form
    21,879.75/30,192.24 = 12,320.51/x
  3. Step 3: Cross multiply
    21,879.75x = 30,192.24 × 12,320.51
  4. Step 4: Simplify right side
    21,879.75x = 371,983,794.84
  5. Step 5: Solve for x
    x = 371,983,794.84/21,879.75
  6. Step 6: Final answer
    x = 17,001.28

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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.