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Finding the Fourth Proportional to 21,399.59, 29,464.36 and 19,431.29

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Solution

The fourth proportional to 21,399.59, 29,464.36 and 19,431.29 is: 26,754.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,399.59 : 29,464.36 = 19,431.29 : x
  2. Step 2: Convert to fraction form
    21,399.59/29,464.36 = 19,431.29/x
  3. Step 3: Cross multiply
    21,399.59x = 29,464.36 × 19,431.29
  4. Step 4: Simplify right side
    21,399.59x = 572,530,548.91
  5. Step 5: Solve for x
    x = 572,530,548.91/21,399.59
  6. Step 6: Final answer
    x = 26,754.27

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.