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Finding the Fourth Proportional to 21,051.52, 29,051.12 and 11,620.08

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Solution

The fourth proportional to 21,051.52, 29,051.12 and 11,620.08 is: 16,035.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,051.52 : 29,051.12 = 11,620.08 : x
  2. Step 2: Convert to fraction form
    21,051.52/29,051.12 = 11,620.08/x
  3. Step 3: Cross multiply
    21,051.52x = 29,051.12 × 11,620.08
  4. Step 4: Simplify right side
    21,051.52x = 337,576,338.49
  5. Step 5: Solve for x
    x = 337,576,338.49/21,051.52
  6. Step 6: Final answer
    x = 16,035.72

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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.