Home / 15,491.82-21,379.04-8,418.70

Finding the Fourth Proportional to 15,491.82, 21,379.04 and 8,418.70

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Solution

The fourth proportional to 15,491.82, 21,379.04 and 8,418.70 is: 11,617.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,491.82 : 21,379.04 = 8,418.70 : x
  2. Step 2: Convert to fraction form
    15,491.82/21,379.04 = 8,418.70/x
  3. Step 3: Cross multiply
    15,491.82x = 21,379.04 × 8,418.70
  4. Step 4: Simplify right side
    15,491.82x = 179,983,724.05
  5. Step 5: Solve for x
    x = 179,983,724.05/15,491.82
  6. Step 6: Final answer
    x = 11,617.98

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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.