Home / 21,152.06-31,720.78-8,668.54

Finding the Fourth Proportional to 21,152.06, 31,720.78 and 8,668.54

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Solution

The fourth proportional to 21,152.06, 31,720.78 and 8,668.54 is: 12,999.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,152.06 : 31,720.78 = 8,668.54 : x
  2. Step 2: Convert to fraction form
    21,152.06/31,720.78 = 8,668.54/x
  3. Step 3: Cross multiply
    21,152.06x = 31,720.78 × 8,668.54
  4. Step 4: Simplify right side
    21,152.06x = 274,972,850.26
  5. Step 5: Solve for x
    x = 274,972,850.26/21,152.06
  6. Step 6: Final answer
    x = 12,999.81

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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.