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Finding the Fourth Proportional to 18,216.70, 25,140.90 and 11,147.80

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Solution

The fourth proportional to 18,216.70, 25,140.90 and 11,147.80 is: 15,385.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,216.70 : 25,140.90 = 11,147.80 : x
  2. Step 2: Convert to fraction form
    18,216.70/25,140.90 = 11,147.80/x
  3. Step 3: Cross multiply
    18,216.70x = 25,140.90 × 11,147.80
  4. Step 4: Simplify right side
    18,216.70x = 280,265,725.02
  5. Step 5: Solve for x
    x = 280,265,725.02/18,216.70
  6. Step 6: Final answer
    x = 15,385.10

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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.