Home / 21,976.19-30,328.55-13,021.80

Finding the Fourth Proportional to 21,976.19, 30,328.55 and 13,021.80

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Solution

The fourth proportional to 21,976.19, 30,328.55 and 13,021.80 is: 17,970.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,976.19 : 30,328.55 = 13,021.80 : x
  2. Step 2: Convert to fraction form
    21,976.19/30,328.55 = 13,021.80/x
  3. Step 3: Cross multiply
    21,976.19x = 30,328.55 × 13,021.80
  4. Step 4: Simplify right side
    21,976.19x = 394,932,182.38
  5. Step 5: Solve for x
    x = 394,932,182.38/21,976.19
  6. Step 6: Final answer
    x = 17,970.91

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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.