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Finding the Fourth Proportional to 15,185.17, 20,954.94 and 8,811.43

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Solution

The fourth proportional to 15,185.17, 20,954.94 and 8,811.43 is: 12,159.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,185.17 : 20,954.94 = 8,811.43 : x
  2. Step 2: Convert to fraction form
    15,185.17/20,954.94 = 8,811.43/x
  3. Step 3: Cross multiply
    15,185.17x = 20,954.94 × 8,811.43
  4. Step 4: Simplify right side
    15,185.17x = 184,642,986.96
  5. Step 5: Solve for x
    x = 184,642,986.96/15,185.17
  6. Step 6: Final answer
    x = 12,159.43

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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.