Home / 21,870-30,180.60-13,491.36

Finding the Fourth Proportional to 21,870, 30,180.60 and 13,491.36

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Solution

The fourth proportional to 21,870, 30,180.60 and 13,491.36 is: 18,618.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,870 : 30,180.60 = 13,491.36 : x
  2. Step 2: Convert to fraction form
    21,870/30,180.60 = 13,491.36/x
  3. Step 3: Cross multiply
    21,870x = 30,180.60 × 13,491.36
  4. Step 4: Simplify right side
    21,870x = 407,177,339.62
  5. Step 5: Solve for x
    x = 407,177,339.62/21,870
  6. Step 6: Final answer
    x = 18,618.08

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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.