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Finding the Fourth Proportional to 20,141.10, 30,211.65 and 18,828.90

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Solution

The fourth proportional to 20,141.10, 30,211.65 and 18,828.90 is: 28,243.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,141.10 : 30,211.65 = 18,828.90 : x
  2. Step 2: Convert to fraction form
    20,141.10/30,211.65 = 18,828.90/x
  3. Step 3: Cross multiply
    20,141.10x = 30,211.65 × 18,828.90
  4. Step 4: Simplify right side
    20,141.10x = 568,852,136.69
  5. Step 5: Solve for x
    x = 568,852,136.69/20,141.10
  6. Step 6: Final answer
    x = 28,243.35

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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.