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Finding the Fourth Proportional to 18,871.92, 28,280.96 and 13,902.48

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Solution

The fourth proportional to 18,871.92, 28,280.96 and 13,902.48 is: 20,833.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.92 : 28,280.96 = 13,902.48 : x
  2. Step 2: Convert to fraction form
    18,871.92/28,280.96 = 13,902.48/x
  3. Step 3: Cross multiply
    18,871.92x = 28,280.96 × 13,902.48
  4. Step 4: Simplify right side
    18,871.92x = 393,175,480.78
  5. Step 5: Solve for x
    x = 393,175,480.78/18,871.92
  6. Step 6: Final answer
    x = 20,833.89

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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.