Home / 21,080.72-29,091.44-11,520.76

Finding the Fourth Proportional to 21,080.72, 29,091.44 and 11,520.76

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Solution

The fourth proportional to 21,080.72, 29,091.44 and 11,520.76 is: 15,898.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,080.72 : 29,091.44 = 11,520.76 : x
  2. Step 2: Convert to fraction form
    21,080.72/29,091.44 = 11,520.76/x
  3. Step 3: Cross multiply
    21,080.72x = 29,091.44 × 11,520.76
  4. Step 4: Simplify right side
    21,080.72x = 335,155,498.29
  5. Step 5: Solve for x
    x = 335,155,498.29/21,080.72
  6. Step 6: Final answer
    x = 15,898.67

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Half scale
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Double scale
Find fourth proportional to 21,081.72, 29,092.82 and 11,521.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.