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Finding the Fourth Proportional to 21,554.64, 29,745.23 and 12,123

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Solution

The fourth proportional to 21,554.64, 29,745.23 and 12,123 is: 16,729.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,554.64 : 29,745.23 = 12,123 : x
  2. Step 2: Convert to fraction form
    21,554.64/29,745.23 = 12,123/x
  3. Step 3: Cross multiply
    21,554.64x = 29,745.23 × 12,123
  4. Step 4: Simplify right side
    21,554.64x = 360,601,362.68
  5. Step 5: Solve for x
    x = 360,601,362.68/21,554.64
  6. Step 6: Final answer
    x = 16,729.64

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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.