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Finding the Fourth Proportional to 68,486.80, 102,665.40 and 40,428.40

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Solution

The fourth proportional to 68,486.80, 102,665.40 and 40,428.40 is: 60,604.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,486.80 : 102,665.40 = 40,428.40 : x
  2. Step 2: Convert to fraction form
    68,486.80/102,665.40 = 40,428.40/x
  3. Step 3: Cross multiply
    68,486.80x = 102,665.40 × 40,428.40
  4. Step 4: Simplify right side
    68,486.80x = 4,150,597,857.36
  5. Step 5: Solve for x
    x = 4,150,597,857.36/68,486.80
  6. Step 6: Final answer
    x = 60,604.35

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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.