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Finding the Fourth Proportional to 21,326.31, 29,430 and 12,375.32

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Solution

The fourth proportional to 21,326.31, 29,430 and 12,375.32 is: 17,077.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,326.31 : 29,430 = 12,375.32 : x
  2. Step 2: Convert to fraction form
    21,326.31/29,430 = 12,375.32/x
  3. Step 3: Cross multiply
    21,326.31x = 29,430 × 12,375.32
  4. Step 4: Simplify right side
    21,326.31x = 364,205,520.45
  5. Step 5: Solve for x
    x = 364,205,520.45/21,326.31
  6. Step 6: Final answer
    x = 17,077.76

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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.