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Finding the Fourth Proportional to 21,651.90, 29,879.99 and 12,699.64

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Solution

The fourth proportional to 21,651.90, 29,879.99 and 12,699.64 is: 17,525.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,651.90 : 29,879.99 = 12,699.64 : x
  2. Step 2: Convert to fraction form
    21,651.90/29,879.99 = 12,699.64/x
  3. Step 3: Cross multiply
    21,651.90x = 29,879.99 × 12,699.64
  4. Step 4: Simplify right side
    21,651.90x = 379,465,116.20
  5. Step 5: Solve for x
    x = 379,465,116.20/21,651.90
  6. Step 6: Final answer
    x = 17,525.72

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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.