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Finding the Fourth Proportional to 268,912.70, 403,325.85 and 81,880.70

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Solution

The fourth proportional to 268,912.70, 403,325.85 and 81,880.70 is: 122,807.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,912.70 : 403,325.85 = 81,880.70 : x
  2. Step 2: Convert to fraction form
    268,912.70/403,325.85 = 81,880.70/x
  3. Step 3: Cross multiply
    268,912.70x = 403,325.85 × 81,880.70
  4. Step 4: Simplify right side
    268,912.70x = 33,024,602,926.10
  5. Step 5: Solve for x
    x = 33,024,602,926.10/268,912.70
  6. Step 6: Final answer
    x = 122,807.90

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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.