Home / 21,179.31-29,215.21-13,207.70

Finding the Fourth Proportional to 21,179.31, 29,215.21 and 13,207.70

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Solution

The fourth proportional to 21,179.31, 29,215.21 and 13,207.70 is: 18,218.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,179.31 : 29,215.21 = 13,207.70 : x
  2. Step 2: Convert to fraction form
    21,179.31/29,215.21 = 13,207.70/x
  3. Step 3: Cross multiply
    21,179.31x = 29,215.21 × 13,207.70
  4. Step 4: Simplify right side
    21,179.31x = 385,865,729.12
  5. Step 5: Solve for x
    x = 385,865,729.12/21,179.31
  6. Step 6: Final answer
    x = 18,218.99

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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.