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Finding the Fourth Proportional to 15,709.85, 21,679.04 and 8,636.22

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Solution

The fourth proportional to 15,709.85, 21,679.04 and 8,636.22 is: 11,917.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.85 : 21,679.04 = 8,636.22 : x
  2. Step 2: Convert to fraction form
    15,709.85/21,679.04 = 8,636.22/x
  3. Step 3: Cross multiply
    15,709.85x = 21,679.04 × 8,636.22
  4. Step 4: Simplify right side
    15,709.85x = 187,224,980.42
  5. Step 5: Solve for x
    x = 187,224,980.42/15,709.85
  6. Step 6: Final answer
    x = 11,917.68

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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.