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Finding the Fourth Proportional to 18,742.70, 28,126.20 and 10,845.20

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Solution

The fourth proportional to 18,742.70, 28,126.20 and 10,845.20 is: 16,274.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,742.70 : 28,126.20 = 10,845.20 : x
  2. Step 2: Convert to fraction form
    18,742.70/28,126.20 = 10,845.20/x
  3. Step 3: Cross multiply
    18,742.70x = 28,126.20 × 10,845.20
  4. Step 4: Simplify right side
    18,742.70x = 305,034,264.24
  5. Step 5: Solve for x
    x = 305,034,264.24/18,742.70
  6. Step 6: Final answer
    x = 16,274.83

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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.