Home / 21,315.43-29,415.81-11,755.45

Finding the Fourth Proportional to 21,315.43, 29,415.81 and 11,755.45

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Solution

The fourth proportional to 21,315.43, 29,415.81 and 11,755.45 is: 16,222.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.43 : 29,415.81 = 11,755.45 : x
  2. Step 2: Convert to fraction form
    21,315.43/29,415.81 = 11,755.45/x
  3. Step 3: Cross multiply
    21,315.43x = 29,415.81 × 11,755.45
  4. Step 4: Simplify right side
    21,315.43x = 345,796,181.12
  5. Step 5: Solve for x
    x = 345,796,181.12/21,315.43
  6. Step 6: Final answer
    x = 16,222.81

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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.