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Finding the Fourth Proportional to 18,873.95, 28,321.86 and 7,778.57

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Solution

The fourth proportional to 18,873.95, 28,321.86 and 7,778.57 is: 11,672.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,873.95 : 28,321.86 = 7,778.57 : x
  2. Step 2: Convert to fraction form
    18,873.95/28,321.86 = 7,778.57/x
  3. Step 3: Cross multiply
    18,873.95x = 28,321.86 × 7,778.57
  4. Step 4: Simplify right side
    18,873.95x = 220,303,570.54
  5. Step 5: Solve for x
    x = 220,303,570.54/18,873.95
  6. Step 6: Final answer
    x = 11,672.36

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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.