Home / 21,890.25-30,209.76-12,942.99

Finding the Fourth Proportional to 21,890.25, 30,209.76 and 12,942.99

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Solution

The fourth proportional to 21,890.25, 30,209.76 and 12,942.99 is: 17,862.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,890.25 : 30,209.76 = 12,942.99 : x
  2. Step 2: Convert to fraction form
    21,890.25/30,209.76 = 12,942.99/x
  3. Step 3: Cross multiply
    21,890.25x = 30,209.76 × 12,942.99
  4. Step 4: Simplify right side
    21,890.25x = 391,004,621.58
  5. Step 5: Solve for x
    x = 391,004,621.58/21,890.25
  6. Step 6: Final answer
    x = 17,862.04

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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.