Home / 21,515.70-29,685.24-13,020.96

Finding the Fourth Proportional to 21,515.70, 29,685.24 and 13,020.96

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Solution

The fourth proportional to 21,515.70, 29,685.24 and 13,020.96 is: 17,965.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,515.70 : 29,685.24 = 13,020.96 : x
  2. Step 2: Convert to fraction form
    21,515.70/29,685.24 = 13,020.96/x
  3. Step 3: Cross multiply
    21,515.70x = 29,685.24 × 13,020.96
  4. Step 4: Simplify right side
    21,515.70x = 386,530,322.63
  5. Step 5: Solve for x
    x = 386,530,322.63/21,515.70
  6. Step 6: Final answer
    x = 17,965.04

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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.