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Finding the Fourth Proportional to 1,241.30, 1,861.68 and 511.22

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Solution

The fourth proportional to 1,241.30, 1,861.68 and 511.22 is: 766.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.30 : 1,861.68 = 511.22 : x
  2. Step 2: Convert to fraction form
    1,241.30/1,861.68 = 511.22/x
  3. Step 3: Cross multiply
    1,241.30x = 1,861.68 × 511.22
  4. Step 4: Simplify right side
    1,241.30x = 951,728.05
  5. Step 5: Solve for x
    x = 951,728.05/1,241.30
  6. Step 6: Final answer
    x = 766.72

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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.