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Finding the Fourth Proportional to 21,393.72, 29,524.92 and 11,961.72

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Solution

The fourth proportional to 21,393.72, 29,524.92 and 11,961.72 is: 16,508.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,393.72 : 29,524.92 = 11,961.72 : x
  2. Step 2: Convert to fraction form
    21,393.72/29,524.92 = 11,961.72/x
  3. Step 3: Cross multiply
    21,393.72x = 29,524.92 × 11,961.72
  4. Step 4: Simplify right side
    21,393.72x = 353,168,826.06
  5. Step 5: Solve for x
    x = 353,168,826.06/21,393.72
  6. Step 6: Final answer
    x = 16,508.06

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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.