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Finding the Fourth Proportional to 18,734.10, 28,101.15 and 12,829.20

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Solution

The fourth proportional to 18,734.10, 28,101.15 and 12,829.20 is: 19,243.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,734.10 : 28,101.15 = 12,829.20 : x
  2. Step 2: Convert to fraction form
    18,734.10/28,101.15 = 12,829.20/x
  3. Step 3: Cross multiply
    18,734.10x = 28,101.15 × 12,829.20
  4. Step 4: Simplify right side
    18,734.10x = 360,515,273.58
  5. Step 5: Solve for x
    x = 360,515,273.58/18,734.10
  6. Step 6: Final answer
    x = 19,243.80

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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.