Home / 21,879.06-30,189.12-12,317.46

Finding the Fourth Proportional to 21,879.06, 30,189.12 and 12,317.46

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Solution

The fourth proportional to 21,879.06, 30,189.12 and 12,317.46 is: 16,995.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879.06 : 30,189.12 = 12,317.46 : x
  2. Step 2: Convert to fraction form
    21,879.06/30,189.12 = 12,317.46/x
  3. Step 3: Cross multiply
    21,879.06x = 30,189.12 × 12,317.46
  4. Step 4: Simplify right side
    21,879.06x = 371,853,278.04
  5. Step 5: Solve for x
    x = 371,853,278.04/21,879.06
  6. Step 6: Final answer
    x = 16,995.85

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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.