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Finding the Fourth Proportional to 18,761.70, 28,142.55 and 4,910.70

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Solution

The fourth proportional to 18,761.70, 28,142.55 and 4,910.70 is: 7,366.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.70 : 28,142.55 = 4,910.70 : x
  2. Step 2: Convert to fraction form
    18,761.70/28,142.55 = 4,910.70/x
  3. Step 3: Cross multiply
    18,761.70x = 28,142.55 × 4,910.70
  4. Step 4: Simplify right side
    18,761.70x = 138,199,620.29
  5. Step 5: Solve for x
    x = 138,199,620.29/18,761.70
  6. Step 6: Final answer
    x = 7,366.05

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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.