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Finding the Fourth Proportional to 28,931.90, 43,300.65 and 20,183.90

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Solution

The fourth proportional to 28,931.90, 43,300.65 and 20,183.90 is: 30,208.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,931.90 : 43,300.65 = 20,183.90 : x
  2. Step 2: Convert to fraction form
    28,931.90/43,300.65 = 20,183.90/x
  3. Step 3: Cross multiply
    28,931.90x = 43,300.65 × 20,183.90
  4. Step 4: Simplify right side
    28,931.90x = 873,975,989.54
  5. Step 5: Solve for x
    x = 873,975,989.54/28,931.90
  6. Step 6: Final answer
    x = 30,208.04

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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.