Home / 21,279.66-31,921.67-8,143.08

Finding the Fourth Proportional to 21,279.66, 31,921.67 and 8,143.08

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Solution

The fourth proportional to 21,279.66, 31,921.67 and 8,143.08 is: 12,215.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.66 : 31,921.67 = 8,143.08 : x
  2. Step 2: Convert to fraction form
    21,279.66/31,921.67 = 8,143.08/x
  3. Step 3: Cross multiply
    21,279.66x = 31,921.67 × 8,143.08
  4. Step 4: Simplify right side
    21,279.66x = 259,940,712.54
  5. Step 5: Solve for x
    x = 259,940,712.54/21,279.66
  6. Step 6: Final answer
    x = 12,215.45

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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.