Home / 21,920.09-30,237.21-12,966.12

Finding the Fourth Proportional to 21,920.09, 30,237.21 and 12,966.12

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Solution

The fourth proportional to 21,920.09, 30,237.21 and 12,966.12 is: 17,885.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.09 : 30,237.21 = 12,966.12 : x
  2. Step 2: Convert to fraction form
    21,920.09/30,237.21 = 12,966.12/x
  3. Step 3: Cross multiply
    21,920.09x = 30,237.21 × 12,966.12
  4. Step 4: Simplify right side
    21,920.09x = 392,059,293.33
  5. Step 5: Solve for x
    x = 392,059,293.33/21,920.09
  6. Step 6: Final answer
    x = 17,885.85

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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.