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Finding the Fourth Proportional to 72,171.71, 108,257.61 and 19,581.18

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Solution

The fourth proportional to 72,171.71, 108,257.61 and 19,581.18 is: 29,371.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,171.71 : 108,257.61 = 19,581.18 : x
  2. Step 2: Convert to fraction form
    72,171.71/108,257.61 = 19,581.18/x
  3. Step 3: Cross multiply
    72,171.71x = 108,257.61 × 19,581.18
  4. Step 4: Simplify right side
    72,171.71x = 2,119,811,747.78
  5. Step 5: Solve for x
    x = 2,119,811,747.78/72,171.71
  6. Step 6: Final answer
    x = 29,371.78

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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.