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Finding the Fourth Proportional to 21,103.92, 29,123.40 and 11,672.40

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Solution

The fourth proportional to 21,103.92, 29,123.40 and 11,672.40 is: 16,107.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,103.92 : 29,123.40 = 11,672.40 : x
  2. Step 2: Convert to fraction form
    21,103.92/29,123.40 = 11,672.40/x
  3. Step 3: Cross multiply
    21,103.92x = 29,123.40 × 11,672.40
  4. Step 4: Simplify right side
    21,103.92x = 339,939,974.16
  5. Step 5: Solve for x
    x = 339,939,974.16/21,103.92
  6. Step 6: Final answer
    x = 16,107.91

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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.