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Finding the Fourth Proportional to 71,310.69, 106,961.72 and 18,719.01

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Solution

The fourth proportional to 71,310.69, 106,961.72 and 18,719.01 is: 28,077.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,310.69 : 106,961.72 = 18,719.01 : x
  2. Step 2: Convert to fraction form
    71,310.69/106,961.72 = 18,719.01/x
  3. Step 3: Cross multiply
    71,310.69x = 106,961.72 × 18,719.01
  4. Step 4: Simplify right side
    71,310.69x = 2,002,217,412.70
  5. Step 5: Solve for x
    x = 2,002,217,412.70/71,310.69
  6. Step 6: Final answer
    x = 28,077.38

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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.