Home / 21,279.11-31,918.67-8,132.81

Finding the Fourth Proportional to 21,279.11, 31,918.67 and 8,132.81

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Solution

The fourth proportional to 21,279.11, 31,918.67 and 8,132.81 is: 12,199.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.11 : 31,918.67 = 8,132.81 : x
  2. Step 2: Convert to fraction form
    21,279.11/31,918.67 = 8,132.81/x
  3. Step 3: Cross multiply
    21,279.11x = 31,918.67 × 8,132.81
  4. Step 4: Simplify right side
    21,279.11x = 259,588,478.56
  5. Step 5: Solve for x
    x = 259,588,478.56/21,279.11
  6. Step 6: Final answer
    x = 12,199.22

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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.