Home / 21,085.44-31,612.78-12,188.22

Finding the Fourth Proportional to 21,085.44, 31,612.78 and 12,188.22

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Solution

The fourth proportional to 21,085.44, 31,612.78 and 12,188.22 is: 18,273.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,085.44 : 31,612.78 = 12,188.22 : x
  2. Step 2: Convert to fraction form
    21,085.44/31,612.78 = 12,188.22/x
  3. Step 3: Cross multiply
    21,085.44x = 31,612.78 × 12,188.22
  4. Step 4: Simplify right side
    21,085.44x = 385,303,517.45
  5. Step 5: Solve for x
    x = 385,303,517.45/21,085.44
  6. Step 6: Final answer
    x = 18,273.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.