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Finding the Fourth Proportional to 268,958.40, 403,437.60 and 81,979.20

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Solution

The fourth proportional to 268,958.40, 403,437.60 and 81,979.20 is: 122,968.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,958.40 : 403,437.60 = 81,979.20 : x
  2. Step 2: Convert to fraction form
    268,958.40/403,437.60 = 81,979.20/x
  3. Step 3: Cross multiply
    268,958.40x = 403,437.60 × 81,979.20
  4. Step 4: Simplify right side
    268,958.40x = 33,073,491,697.92
  5. Step 5: Solve for x
    x = 33,073,491,697.92/268,958.40
  6. Step 6: Final answer
    x = 122,968.80

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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.