Home / 21,761.40-30,028.14-12,808.20

Finding the Fourth Proportional to 21,761.40, 30,028.14 and 12,808.20

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Solution

The fourth proportional to 21,761.40, 30,028.14 and 12,808.20 is: 17,673.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,761.40 : 30,028.14 = 12,808.20 : x
  2. Step 2: Convert to fraction form
    21,761.40/30,028.14 = 12,808.20/x
  3. Step 3: Cross multiply
    21,761.40x = 30,028.14 × 12,808.20
  4. Step 4: Simplify right side
    21,761.40x = 384,606,422.75
  5. Step 5: Solve for x
    x = 384,606,422.75/21,761.40
  6. Step 6: Final answer
    x = 17,673.79

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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.