Home / 21,084.45-29,109.96-13,138.35

Finding the Fourth Proportional to 21,084.45, 29,109.96 and 13,138.35

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Solution

The fourth proportional to 21,084.45, 29,109.96 and 13,138.35 is: 18,139.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,084.45 : 29,109.96 = 13,138.35 : x
  2. Step 2: Convert to fraction form
    21,084.45/29,109.96 = 13,138.35/x
  3. Step 3: Cross multiply
    21,084.45x = 29,109.96 × 13,138.35
  4. Step 4: Simplify right side
    21,084.45x = 382,456,842.97
  5. Step 5: Solve for x
    x = 382,456,842.97/21,084.45
  6. Step 6: Final answer
    x = 18,139.28

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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.