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Finding the Fourth Proportional to 21,674.70, 29,906.10 and 12,718.98

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Solution

The fourth proportional to 21,674.70, 29,906.10 and 12,718.98 is: 17,549.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,674.70 : 29,906.10 = 12,718.98 : x
  2. Step 2: Convert to fraction form
    21,674.70/29,906.10 = 12,718.98/x
  3. Step 3: Cross multiply
    21,674.70x = 29,906.10 × 12,718.98
  4. Step 4: Simplify right side
    21,674.70x = 380,375,087.78
  5. Step 5: Solve for x
    x = 380,375,087.78/21,674.70
  6. Step 6: Final answer
    x = 17,549.27

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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.