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Finding the Fourth Proportional to 18,768.80, 25,900.80 and 11,218.40

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Solution

The fourth proportional to 18,768.80, 25,900.80 and 11,218.40 is: 15,481.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.80 : 25,900.80 = 11,218.40 : x
  2. Step 2: Convert to fraction form
    18,768.80/25,900.80 = 11,218.40/x
  3. Step 3: Cross multiply
    18,768.80x = 25,900.80 × 11,218.40
  4. Step 4: Simplify right side
    18,768.80x = 290,565,534.72
  5. Step 5: Solve for x
    x = 290,565,534.72/18,768.80
  6. Step 6: Final answer
    x = 15,481.31

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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.