Home / 21,815.40-30,102.22-12,382.14

Finding the Fourth Proportional to 21,815.40, 30,102.22 and 12,382.14

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Solution

The fourth proportional to 21,815.40, 30,102.22 and 12,382.14 is: 17,085.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.40 : 30,102.22 = 12,382.14 : x
  2. Step 2: Convert to fraction form
    21,815.40/30,102.22 = 12,382.14/x
  3. Step 3: Cross multiply
    21,815.40x = 30,102.22 × 12,382.14
  4. Step 4: Simplify right side
    21,815.40x = 372,729,902.35
  5. Step 5: Solve for x
    x = 372,729,902.35/21,815.40
  6. Step 6: Final answer
    x = 17,085.63

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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.