Home / 21,010.31-31,515.35-12,119.88

Finding the Fourth Proportional to 21,010.31, 31,515.35 and 12,119.88

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Solution

The fourth proportional to 21,010.31, 31,515.35 and 12,119.88 is: 18,179.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,010.31 : 31,515.35 = 12,119.88 : x
  2. Step 2: Convert to fraction form
    21,010.31/31,515.35 = 12,119.88/x
  3. Step 3: Cross multiply
    21,010.31x = 31,515.35 × 12,119.88
  4. Step 4: Simplify right side
    21,010.31x = 381,962,290.46
  5. Step 5: Solve for x
    x = 381,962,290.46/21,010.31
  6. Step 6: Final answer
    x = 18,179.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.