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Finding the Fourth Proportional to 18,755.76, 28,137.68 and 5,609.20

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Solution

The fourth proportional to 18,755.76, 28,137.68 and 5,609.20 is: 8,415.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,755.76 : 28,137.68 = 5,609.20 : x
  2. Step 2: Convert to fraction form
    18,755.76/28,137.68 = 5,609.20/x
  3. Step 3: Cross multiply
    18,755.76x = 28,137.68 × 5,609.20
  4. Step 4: Simplify right side
    18,755.76x = 157,829,874.66
  5. Step 5: Solve for x
    x = 157,829,874.66/18,755.76
  6. Step 6: Final answer
    x = 8,415.01

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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.