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Finding the Fourth Proportional to 11,871.70, 17,811.68 and 4,478.29

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Solution

The fourth proportional to 11,871.70, 17,811.68 and 4,478.29 is: 6,718.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,871.70 : 17,811.68 = 4,478.29 : x
  2. Step 2: Convert to fraction form
    11,871.70/17,811.68 = 4,478.29/x
  3. Step 3: Cross multiply
    11,871.70x = 17,811.68 × 4,478.29
  4. Step 4: Simplify right side
    11,871.70x = 79,765,868.43
  5. Step 5: Solve for x
    x = 79,765,868.43/11,871.70
  6. Step 6: Final answer
    x = 6,718.99

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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.