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Finding the Fourth Proportional to 20,950.56, 28,911.72 and 11,518.92

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Solution

The fourth proportional to 20,950.56, 28,911.72 and 11,518.92 is: 15,896.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,950.56 : 28,911.72 = 11,518.92 : x
  2. Step 2: Convert to fraction form
    20,950.56/28,911.72 = 11,518.92/x
  3. Step 3: Cross multiply
    20,950.56x = 28,911.72 × 11,518.92
  4. Step 4: Simplify right side
    20,950.56x = 333,031,789.74
  5. Step 5: Solve for x
    x = 333,031,789.74/20,950.56
  6. Step 6: Final answer
    x = 15,896.08

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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.