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Finding the Fourth Proportional to 18,809.76, 28,218.36 and 5,661.48

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Solution

The fourth proportional to 18,809.76, 28,218.36 and 5,661.48 is: 8,493.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,809.76 : 28,218.36 = 5,661.48 : x
  2. Step 2: Convert to fraction form
    18,809.76/28,218.36 = 5,661.48/x
  3. Step 3: Cross multiply
    18,809.76x = 28,218.36 × 5,661.48
  4. Step 4: Simplify right side
    18,809.76x = 159,757,680.77
  5. Step 5: Solve for x
    x = 159,757,680.77/18,809.76
  6. Step 6: Final answer
    x = 8,493.34

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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.