Home / 39,405.78-54,379.41-21,500.43

Finding the Fourth Proportional to 39,405.78, 54,379.41 and 21,500.43

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Solution

The fourth proportional to 39,405.78, 54,379.41 and 21,500.43 is: 29,670.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,405.78 : 54,379.41 = 21,500.43 : x
  2. Step 2: Convert to fraction form
    39,405.78/54,379.41 = 21,500.43/x
  3. Step 3: Cross multiply
    39,405.78x = 54,379.41 × 21,500.43
  4. Step 4: Simplify right side
    39,405.78x = 1,169,180,698.15
  5. Step 5: Solve for x
    x = 1,169,180,698.15/39,405.78
  6. Step 6: Final answer
    x = 29,670.28

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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.