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Finding the Fourth Proportional to 18,841.80, 28,261.32 and 7,745.48

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Solution

The fourth proportional to 18,841.80, 28,261.32 and 7,745.48 is: 11,617.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,841.80 : 28,261.32 = 7,745.48 : x
  2. Step 2: Convert to fraction form
    18,841.80/28,261.32 = 7,745.48/x
  3. Step 3: Cross multiply
    18,841.80x = 28,261.32 × 7,745.48
  4. Step 4: Simplify right side
    18,841.80x = 218,897,488.83
  5. Step 5: Solve for x
    x = 218,897,488.83/18,841.80
  6. Step 6: Final answer
    x = 11,617.65

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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.