Home / 21,678.28-29,918.10-13,179.76

Finding the Fourth Proportional to 21,678.28, 29,918.10 and 13,179.76

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Solution

The fourth proportional to 21,678.28, 29,918.10 and 13,179.76 is: 18,189.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.28 : 29,918.10 = 13,179.76 : x
  2. Step 2: Convert to fraction form
    21,678.28/29,918.10 = 13,179.76/x
  3. Step 3: Cross multiply
    21,678.28x = 29,918.10 × 13,179.76
  4. Step 4: Simplify right side
    21,678.28x = 394,313,377.66
  5. Step 5: Solve for x
    x = 394,313,377.66/21,678.28
  6. Step 6: Final answer
    x = 18,189.33

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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.