Home / 21,939.09-30,275.93-12,381

Finding the Fourth Proportional to 21,939.09, 30,275.93 and 12,381

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Solution

The fourth proportional to 21,939.09, 30,275.93 and 12,381 is: 17,085.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.09 : 30,275.93 = 12,381 : x
  2. Step 2: Convert to fraction form
    21,939.09/30,275.93 = 12,381/x
  3. Step 3: Cross multiply
    21,939.09x = 30,275.93 × 12,381
  4. Step 4: Simplify right side
    21,939.09x = 374,846,227.43
  5. Step 5: Solve for x
    x = 374,846,227.43/21,939.09
  6. Step 6: Final answer
    x = 17,085.77

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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.