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Finding the Fourth Proportional to 21,189, 29,239.81 and 11,628.66

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Solution

The fourth proportional to 21,189, 29,239.81 and 11,628.66 is: 16,047.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,189 : 29,239.81 = 11,628.66 : x
  2. Step 2: Convert to fraction form
    21,189/29,239.81 = 11,628.66/x
  3. Step 3: Cross multiply
    21,189x = 29,239.81 × 11,628.66
  4. Step 4: Simplify right side
    21,189x = 340,019,808.95
  5. Step 5: Solve for x
    x = 340,019,808.95/21,189
  6. Step 6: Final answer
    x = 16,047.00

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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.