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Finding the Fourth Proportional to 21,650.72, 29,878 and 12,221.28

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Solution

The fourth proportional to 21,650.72, 29,878 and 12,221.28 is: 16,865.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,650.72 : 29,878 = 12,221.28 : x
  2. Step 2: Convert to fraction form
    21,650.72/29,878 = 12,221.28/x
  3. Step 3: Cross multiply
    21,650.72x = 29,878 × 12,221.28
  4. Step 4: Simplify right side
    21,650.72x = 365,147,403.84
  5. Step 5: Solve for x
    x = 365,147,403.84/21,650.72
  6. Step 6: Final answer
    x = 16,865.37

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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.