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Finding the Fourth Proportional to 18,745.80, 28,116.90 and 7,653.48

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Solution

The fourth proportional to 18,745.80, 28,116.90 and 7,653.48 is: 11,479.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,745.80 : 28,116.90 = 7,653.48 : x
  2. Step 2: Convert to fraction form
    18,745.80/28,116.90 = 7,653.48/x
  3. Step 3: Cross multiply
    18,745.80x = 28,116.90 × 7,653.48
  4. Step 4: Simplify right side
    18,745.80x = 215,192,131.81
  5. Step 5: Solve for x
    x = 215,192,131.81/18,745.80
  6. Step 6: Final answer
    x = 11,479.49

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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.