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Finding the Fourth Proportional to 81,938.40, 122,907.60 and 26,534.40

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Solution

The fourth proportional to 81,938.40, 122,907.60 and 26,534.40 is: 39,801.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,938.40 : 122,907.60 = 26,534.40 : x
  2. Step 2: Convert to fraction form
    81,938.40/122,907.60 = 26,534.40/x
  3. Step 3: Cross multiply
    81,938.40x = 122,907.60 × 26,534.40
  4. Step 4: Simplify right side
    81,938.40x = 3,261,279,421.44
  5. Step 5: Solve for x
    x = 3,261,279,421.44/81,938.40
  6. Step 6: Final answer
    x = 39,801.60

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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.