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Finding the Fourth Proportional to 18,965.00, 28,448.86 and 7,278.21

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Solution

The fourth proportional to 18,965.00, 28,448.86 and 7,278.21 is: 10,917.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,965.00 : 28,448.86 = 7,278.21 : x
  2. Step 2: Convert to fraction form
    18,965.00/28,448.86 = 7,278.21/x
  3. Step 3: Cross multiply
    18,965.00x = 28,448.86 × 7,278.21
  4. Step 4: Simplify right side
    18,965.00x = 207,056,759.15
  5. Step 5: Solve for x
    x = 207,056,759.15/18,965.00
  6. Step 6: Final answer
    x = 10,917.84

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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.