Home / 21,279.04-31,915.22-8,128.49

Finding the Fourth Proportional to 21,279.04, 31,915.22 and 8,128.49

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Solution

The fourth proportional to 21,279.04, 31,915.22 and 8,128.49 is: 12,191.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.04 : 31,915.22 = 8,128.49 : x
  2. Step 2: Convert to fraction form
    21,279.04/31,915.22 = 8,128.49/x
  3. Step 3: Cross multiply
    21,279.04x = 31,915.22 × 8,128.49
  4. Step 4: Simplify right side
    21,279.04x = 259,422,546.62
  5. Step 5: Solve for x
    x = 259,422,546.62/21,279.04
  6. Step 6: Final answer
    x = 12,191.46

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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.