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Finding the Fourth Proportional to 45,857.40, 68,816.62 and 18,861.90

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Solution

The fourth proportional to 45,857.40, 68,816.62 and 18,861.90 is: 28,305.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,857.40 : 68,816.62 = 18,861.90 : x
  2. Step 2: Convert to fraction form
    45,857.40/68,816.62 = 18,861.90/x
  3. Step 3: Cross multiply
    45,857.40x = 68,816.62 × 18,861.90
  4. Step 4: Simplify right side
    45,857.40x = 1,298,012,204.78
  5. Step 5: Solve for x
    x = 1,298,012,204.78/45,857.40
  6. Step 6: Final answer
    x = 28,305.40

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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.