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Finding the Fourth Proportional to 31,405.94, 43,342.77 and 18,830.42

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Solution

The fourth proportional to 31,405.94, 43,342.77 and 18,830.42 is: 25,987.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,405.94 : 43,342.77 = 18,830.42 : x
  2. Step 2: Convert to fraction form
    31,405.94/43,342.77 = 18,830.42/x
  3. Step 3: Cross multiply
    31,405.94x = 43,342.77 × 18,830.42
  4. Step 4: Simplify right side
    31,405.94x = 816,162,563.06
  5. Step 5: Solve for x
    x = 816,162,563.06/31,405.94
  6. Step 6: Final answer
    x = 25,987.52

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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.