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Finding the Fourth Proportional to 21,560.51, 29,753.78 and 12,129

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Solution

The fourth proportional to 21,560.51, 29,753.78 and 12,129 is: 16,738.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,560.51 : 29,753.78 = 12,129 : x
  2. Step 2: Convert to fraction form
    21,560.51/29,753.78 = 12,129/x
  3. Step 3: Cross multiply
    21,560.51x = 29,753.78 × 12,129
  4. Step 4: Simplify right side
    21,560.51x = 360,883,536.98
  5. Step 5: Solve for x
    x = 360,883,536.98/21,560.51
  6. Step 6: Final answer
    x = 16,738.18

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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.