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Finding the Fourth Proportional to 21,608.18, 29,819.30 and 11,672.18

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Solution

The fourth proportional to 21,608.18, 29,819.30 and 11,672.18 is: 16,107.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,608.18 : 29,819.30 = 11,672.18 : x
  2. Step 2: Convert to fraction form
    21,608.18/29,819.30 = 11,672.18/x
  3. Step 3: Cross multiply
    21,608.18x = 29,819.30 × 11,672.18
  4. Step 4: Simplify right side
    21,608.18x = 348,056,178.71
  5. Step 5: Solve for x
    x = 348,056,178.71/21,608.18
  6. Step 6: Final answer
    x = 16,107.61

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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.