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Finding the Fourth Proportional to 45,139.40, 67,719.90 and 18,830.60

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Solution

The fourth proportional to 45,139.40, 67,719.90 and 18,830.60 is: 28,250.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,139.40 : 67,719.90 = 18,830.60 : x
  2. Step 2: Convert to fraction form
    45,139.40/67,719.90 = 18,830.60/x
  3. Step 3: Cross multiply
    45,139.40x = 67,719.90 × 18,830.60
  4. Step 4: Simplify right side
    45,139.40x = 1,275,206,348.94
  5. Step 5: Solve for x
    x = 1,275,206,348.94/45,139.40
  6. Step 6: Final answer
    x = 28,250.41

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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.