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Finding the Fourth Proportional to 21,166.92, 29,201.94 and 13,611.96

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Solution

The fourth proportional to 21,166.92, 29,201.94 and 13,611.96 is: 18,779.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,166.92 : 29,201.94 = 13,611.96 : x
  2. Step 2: Convert to fraction form
    21,166.92/29,201.94 = 13,611.96/x
  3. Step 3: Cross multiply
    21,166.92x = 29,201.94 × 13,611.96
  4. Step 4: Simplify right side
    21,166.92x = 397,495,639.20
  5. Step 5: Solve for x
    x = 397,495,639.20/21,166.92
  6. Step 6: Final answer
    x = 18,779.10

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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.