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Finding the Fourth Proportional to 21,110.94, 29,131.89 and 11,678.94

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Solution

The fourth proportional to 21,110.94, 29,131.89 and 11,678.94 is: 16,116.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,110.94 : 29,131.89 = 11,678.94 : x
  2. Step 2: Convert to fraction form
    21,110.94/29,131.89 = 11,678.94/x
  3. Step 3: Cross multiply
    21,110.94x = 29,131.89 × 11,678.94
  4. Step 4: Simplify right side
    21,110.94x = 340,229,595.40
  5. Step 5: Solve for x
    x = 340,229,595.40/21,110.94
  6. Step 6: Final answer
    x = 16,116.27

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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.