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Finding the Fourth Proportional to 15,756.22, 21,742.72 and 8,682.09

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Solution

The fourth proportional to 15,756.22, 21,742.72 and 8,682.09 is: 11,980.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,756.22 : 21,742.72 = 8,682.09 : x
  2. Step 2: Convert to fraction form
    15,756.22/21,742.72 = 8,682.09/x
  3. Step 3: Cross multiply
    15,756.22x = 21,742.72 × 8,682.09
  4. Step 4: Simplify right side
    15,756.22x = 188,772,251.88
  5. Step 5: Solve for x
    x = 188,772,251.88/15,756.22
  6. Step 6: Final answer
    x = 11,980.81

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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.