Home / 21,278.21-31,919.42-8,141.63

Finding the Fourth Proportional to 21,278.21, 31,919.42 and 8,141.63

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Solution

The fourth proportional to 21,278.21, 31,919.42 and 8,141.63 is: 12,213.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.21 : 31,919.42 = 8,141.63 : x
  2. Step 2: Convert to fraction form
    21,278.21/31,919.42 = 8,141.63/x
  3. Step 3: Cross multiply
    21,278.21x = 31,919.42 × 8,141.63
  4. Step 4: Simplify right side
    21,278.21x = 259,875,968.21
  5. Step 5: Solve for x
    x = 259,875,968.21/21,278.21
  6. Step 6: Final answer
    x = 12,213.25

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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.