Home / 21,278.44-29,370.90-12,786.76

Finding the Fourth Proportional to 21,278.44, 29,370.90 and 12,786.76

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Solution

The fourth proportional to 21,278.44, 29,370.90 and 12,786.76 is: 17,649.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.44 : 29,370.90 = 12,786.76 : x
  2. Step 2: Convert to fraction form
    21,278.44/29,370.90 = 12,786.76/x
  3. Step 3: Cross multiply
    21,278.44x = 29,370.90 × 12,786.76
  4. Step 4: Simplify right side
    21,278.44x = 375,558,649.28
  5. Step 5: Solve for x
    x = 375,558,649.28/21,278.44
  6. Step 6: Final answer
    x = 17,649.73

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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.