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Finding the Fourth Proportional to 21,118.44, 29,140.90 and 11,686.44

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Solution

The fourth proportional to 21,118.44, 29,140.90 and 11,686.44 is: 16,125.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.44 : 29,140.90 = 11,686.44 : x
  2. Step 2: Convert to fraction form
    21,118.44/29,140.90 = 11,686.44/x
  3. Step 3: Cross multiply
    21,118.44x = 29,140.90 × 11,686.44
  4. Step 4: Simplify right side
    21,118.44x = 340,553,379.40
  5. Step 5: Solve for x
    x = 340,553,379.40/21,118.44
  6. Step 6: Final answer
    x = 16,125.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.