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Finding the Fourth Proportional to 39,420, 54,399.60 and 25,291.98

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Solution

The fourth proportional to 39,420, 54,399.60 and 25,291.98 is: 34,902.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,420 : 54,399.60 = 25,291.98 : x
  2. Step 2: Convert to fraction form
    39,420/54,399.60 = 25,291.98/x
  3. Step 3: Cross multiply
    39,420x = 54,399.60 × 25,291.98
  4. Step 4: Simplify right side
    39,420x = 1,375,873,595.21
  5. Step 5: Solve for x
    x = 1,375,873,595.21/39,420
  6. Step 6: Final answer
    x = 34,902.93

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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.