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Finding the Fourth Proportional to 20,172.70, 30,254.96 and 19,172.40

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Solution

The fourth proportional to 20,172.70, 30,254.96 and 19,172.40 is: 28,754.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,172.70 : 30,254.96 = 19,172.40 : x
  2. Step 2: Convert to fraction form
    20,172.70/30,254.96 = 19,172.40/x
  3. Step 3: Cross multiply
    20,172.70x = 30,254.96 × 19,172.40
  4. Step 4: Simplify right side
    20,172.70x = 580,060,195.10
  5. Step 5: Solve for x
    x = 580,060,195.10/20,172.70
  6. Step 6: Final answer
    x = 28,754.71

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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.