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Finding the Fourth Proportional to 21,608.86, 29,822.95 and 12,659.78

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Solution

The fourth proportional to 21,608.86, 29,822.95 and 12,659.78 is: 17,472.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,608.86 : 29,822.95 = 12,659.78 : x
  2. Step 2: Convert to fraction form
    21,608.86/29,822.95 = 12,659.78/x
  3. Step 3: Cross multiply
    21,608.86x = 29,822.95 × 12,659.78
  4. Step 4: Simplify right side
    21,608.86x = 377,551,985.95
  5. Step 5: Solve for x
    x = 377,551,985.95/21,608.86
  6. Step 6: Final answer
    x = 17,472.09

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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.