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Finding the Fourth Proportional to 21,658.70, 29,889.08 and 11,722.70

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Solution

The fourth proportional to 21,658.70, 29,889.08 and 11,722.70 is: 16,177.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,658.70 : 29,889.08 = 11,722.70 : x
  2. Step 2: Convert to fraction form
    21,658.70/29,889.08 = 11,722.70/x
  3. Step 3: Cross multiply
    21,658.70x = 29,889.08 × 11,722.70
  4. Step 4: Simplify right side
    21,658.70x = 350,380,718.12
  5. Step 5: Solve for x
    x = 350,380,718.12/21,658.70
  6. Step 6: Final answer
    x = 16,177.37

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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.