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Finding the Fourth Proportional to 18,871.57, 28,381.27 and 15,919.12

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Solution

The fourth proportional to 18,871.57, 28,381.27 and 15,919.12 is: 23,941.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.57 : 28,381.27 = 15,919.12 : x
  2. Step 2: Convert to fraction form
    18,871.57/28,381.27 = 15,919.12/x
  3. Step 3: Cross multiply
    18,871.57x = 28,381.27 × 15,919.12
  4. Step 4: Simplify right side
    18,871.57x = 451,804,842.88
  5. Step 5: Solve for x
    x = 451,804,842.88/18,871.57
  6. Step 6: Final answer
    x = 23,941.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.