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Finding the Fourth Proportional to 268,431.85, 402,638.54 and 68,753.97

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Solution

The fourth proportional to 268,431.85, 402,638.54 and 68,753.97 is: 103,128.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,431.85 : 402,638.54 = 68,753.97 : x
  2. Step 2: Convert to fraction form
    268,431.85/402,638.54 = 68,753.97/x
  3. Step 3: Cross multiply
    268,431.85x = 402,638.54 × 68,753.97
  4. Step 4: Simplify right side
    268,431.85x = 27,682,996,086.81
  5. Step 5: Solve for x
    x = 27,682,996,086.81/268,431.85
  6. Step 6: Final answer
    x = 103,128.58

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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.