Home / 21,821.85-30,112.68-12,868.92

Finding the Fourth Proportional to 21,821.85, 30,112.68 and 12,868.92

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Solution

The fourth proportional to 21,821.85, 30,112.68 and 12,868.92 is: 17,758.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,821.85 : 30,112.68 = 12,868.92 : x
  2. Step 2: Convert to fraction form
    21,821.85/30,112.68 = 12,868.92/x
  3. Step 3: Cross multiply
    21,821.85x = 30,112.68 × 12,868.92
  4. Step 4: Simplify right side
    21,821.85x = 387,517,669.91
  5. Step 5: Solve for x
    x = 387,517,669.91/21,821.85
  6. Step 6: Final answer
    x = 17,758.24

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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.