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Finding the Fourth Proportional to 21,676.60, 29,917.11 and 15,706.09

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Solution

The fourth proportional to 21,676.60, 29,917.11 and 15,706.09 is: 21,676.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,676.60 : 29,917.11 = 15,706.09 : x
  2. Step 2: Convert to fraction form
    21,676.60/29,917.11 = 15,706.09/x
  3. Step 3: Cross multiply
    21,676.60x = 29,917.11 × 15,706.09
  4. Step 4: Simplify right side
    21,676.60x = 469,880,822.20
  5. Step 5: Solve for x
    x = 469,880,822.20/21,676.60
  6. Step 6: Final answer
    x = 21,676.87

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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.