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Finding the Fourth Proportional to 28,014.60, 42,021.90 and 20,141.40

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Solution

The fourth proportional to 28,014.60, 42,021.90 and 20,141.40 is: 30,212.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,014.60 : 42,021.90 = 20,141.40 : x
  2. Step 2: Convert to fraction form
    28,014.60/42,021.90 = 20,141.40/x
  3. Step 3: Cross multiply
    28,014.60x = 42,021.90 × 20,141.40
  4. Step 4: Simplify right side
    28,014.60x = 846,379,896.66
  5. Step 5: Solve for x
    x = 846,379,896.66/28,014.60
  6. Step 6: Final answer
    x = 30,212.10

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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.