Home / 21,581.21-29,775.12-13,086.74

Finding the Fourth Proportional to 21,581.21, 29,775.12 and 13,086.74

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Solution

The fourth proportional to 21,581.21, 29,775.12 and 13,086.74 is: 18,055.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,581.21 : 29,775.12 = 13,086.74 : x
  2. Step 2: Convert to fraction form
    21,581.21/29,775.12 = 13,086.74/x
  3. Step 3: Cross multiply
    21,581.21x = 29,775.12 × 13,086.74
  4. Step 4: Simplify right side
    21,581.21x = 389,659,253.91
  5. Step 5: Solve for x
    x = 389,659,253.91/21,581.21
  6. Step 6: Final answer
    x = 18,055.49

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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.