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Finding the Fourth Proportional to 18,751.20, 28,107.60 and 10,418.40

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Solution

The fourth proportional to 18,751.20, 28,107.60 and 10,418.40 is: 15,616.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.20 : 28,107.60 = 10,418.40 : x
  2. Step 2: Convert to fraction form
    18,751.20/28,107.60 = 10,418.40/x
  3. Step 3: Cross multiply
    18,751.20x = 28,107.60 × 10,418.40
  4. Step 4: Simplify right side
    18,751.20x = 292,836,219.84
  5. Step 5: Solve for x
    x = 292,836,219.84/18,751.20
  6. Step 6: Final answer
    x = 15,616.93

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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.