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Finding the Fourth Proportional to 39,278, 54,204.05 and 21,372.95

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Solution

The fourth proportional to 39,278, 54,204.05 and 21,372.95 is: 29,494.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,278 : 54,204.05 = 21,372.95 : x
  2. Step 2: Convert to fraction form
    39,278/54,204.05 = 21,372.95/x
  3. Step 3: Cross multiply
    39,278x = 54,204.05 × 21,372.95
  4. Step 4: Simplify right side
    39,278x = 1,158,500,450.45
  5. Step 5: Solve for x
    x = 1,158,500,450.45/39,278
  6. Step 6: Final answer
    x = 29,494.89

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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.