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Finding the Fourth Proportional to 45,321.80, 67,987.31 and 21,625.29

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Solution

The fourth proportional to 45,321.80, 67,987.31 and 21,625.29 is: 32,440.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,321.80 : 67,987.31 = 21,625.29 : x
  2. Step 2: Convert to fraction form
    45,321.80/67,987.31 = 21,625.29/x
  3. Step 3: Cross multiply
    45,321.80x = 67,987.31 × 21,625.29
  4. Step 4: Simplify right side
    45,321.80x = 1,470,245,186.94
  5. Step 5: Solve for x
    x = 1,470,245,186.94/45,321.80
  6. Step 6: Final answer
    x = 32,440.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.