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Finding the Fourth Proportional to 21,079.28, 29,091.12 and 11,648

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Solution

The fourth proportional to 21,079.28, 29,091.12 and 11,648 is: 16,075.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.28 : 29,091.12 = 11,648 : x
  2. Step 2: Convert to fraction form
    21,079.28/29,091.12 = 11,648/x
  3. Step 3: Cross multiply
    21,079.28x = 29,091.12 × 11,648
  4. Step 4: Simplify right side
    21,079.28x = 338,853,365.76
  5. Step 5: Solve for x
    x = 338,853,365.76/21,079.28
  6. Step 6: Final answer
    x = 16,075.19

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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.