Home / 21,185.43-29,236.82-12,688.94

Finding the Fourth Proportional to 21,185.43, 29,236.82 and 12,688.94

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Solution

The fourth proportional to 21,185.43, 29,236.82 and 12,688.94 is: 17,511.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,185.43 : 29,236.82 = 12,688.94 : x
  2. Step 2: Convert to fraction form
    21,185.43/29,236.82 = 12,688.94/x
  3. Step 3: Cross multiply
    21,185.43x = 29,236.82 × 12,688.94
  4. Step 4: Simplify right side
    21,185.43x = 370,984,045.14
  5. Step 5: Solve for x
    x = 370,984,045.14/21,185.43
  6. Step 6: Final answer
    x = 17,511.28

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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.