Home / 21,581.12-29,780.70-13,910.78

Finding the Fourth Proportional to 21,581.12, 29,780.70 and 13,910.78

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Solution

The fourth proportional to 21,581.12, 29,780.70 and 13,910.78 is: 19,196.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,581.12 : 29,780.70 = 13,910.78 : x
  2. Step 2: Convert to fraction form
    21,581.12/29,780.70 = 13,910.78/x
  3. Step 3: Cross multiply
    21,581.12x = 29,780.70 × 13,910.78
  4. Step 4: Simplify right side
    21,581.12x = 414,272,765.95
  5. Step 5: Solve for x
    x = 414,272,765.95/21,581.12
  6. Step 6: Final answer
    x = 19,196.07

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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.