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Finding the Fourth Proportional to 28,486.06, 42,729.78 and 8,764.78

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Solution

The fourth proportional to 28,486.06, 42,729.78 and 8,764.78 is: 13,147.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,486.06 : 42,729.78 = 8,764.78 : x
  2. Step 2: Convert to fraction form
    28,486.06/42,729.78 = 8,764.78/x
  3. Step 3: Cross multiply
    28,486.06x = 42,729.78 × 8,764.78
  4. Step 4: Simplify right side
    28,486.06x = 374,517,121.15
  5. Step 5: Solve for x
    x = 374,517,121.15/28,486.06
  6. Step 6: Final answer
    x = 13,147.38

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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.