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Finding the Fourth Proportional to 18,858.75, 28,288.71 and 7,015.47

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Solution

The fourth proportional to 18,858.75, 28,288.71 and 7,015.47 is: 10,523.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.75 : 28,288.71 = 7,015.47 : x
  2. Step 2: Convert to fraction form
    18,858.75/28,288.71 = 7,015.47/x
  3. Step 3: Cross multiply
    18,858.75x = 28,288.71 × 7,015.47
  4. Step 4: Simplify right side
    18,858.75x = 198,458,596.34
  5. Step 5: Solve for x
    x = 198,458,596.34/18,858.75
  6. Step 6: Final answer
    x = 10,523.42

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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.