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Finding the Fourth Proportional to 18,738.64, 28,125 and 9,980.92

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Solution

The fourth proportional to 18,738.64, 28,125 and 9,980.92 is: 14,980.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,738.64 : 28,125 = 9,980.92 : x
  2. Step 2: Convert to fraction form
    18,738.64/28,125 = 9,980.92/x
  3. Step 3: Cross multiply
    18,738.64x = 28,125 × 9,980.92
  4. Step 4: Simplify right side
    18,738.64x = 280,713,375
  5. Step 5: Solve for x
    x = 280,713,375/18,738.64
  6. Step 6: Final answer
    x = 14,980.46

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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.