Home / 21,145.50-31,729.91-11,790.77

Finding the Fourth Proportional to 21,145.50, 31,729.91 and 11,790.77

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Solution

The fourth proportional to 21,145.50, 31,729.91 and 11,790.77 is: 17,692.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,145.50 : 31,729.91 = 11,790.77 : x
  2. Step 2: Convert to fraction form
    21,145.50/31,729.91 = 11,790.77/x
  3. Step 3: Cross multiply
    21,145.50x = 31,729.91 × 11,790.77
  4. Step 4: Simplify right side
    21,145.50x = 374,119,853.33
  5. Step 5: Solve for x
    x = 374,119,853.33/21,145.50
  6. Step 6: Final answer
    x = 17,692.65

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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.