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Finding the Fourth Proportional to 19,491.33, 26,891.90 and 11,929.78

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Solution

The fourth proportional to 19,491.33, 26,891.90 and 11,929.78 is: 16,459.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,491.33 : 26,891.90 = 11,929.78 : x
  2. Step 2: Convert to fraction form
    19,491.33/26,891.90 = 11,929.78/x
  3. Step 3: Cross multiply
    19,491.33x = 26,891.90 × 11,929.78
  4. Step 4: Simplify right side
    19,491.33x = 320,814,460.13
  5. Step 5: Solve for x
    x = 320,814,460.13/19,491.33
  6. Step 6: Final answer
    x = 16,459.34

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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.