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Finding the Fourth Proportional to 1,241.28, 1,861.56 and 419.40

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Solution

The fourth proportional to 1,241.28, 1,861.56 and 419.40 is: 628.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.28 : 1,861.56 = 419.40 : x
  2. Step 2: Convert to fraction form
    1,241.28/1,861.56 = 419.40/x
  3. Step 3: Cross multiply
    1,241.28x = 1,861.56 × 419.40
  4. Step 4: Simplify right side
    1,241.28x = 780,738.26
  5. Step 5: Solve for x
    x = 780,738.26/1,241.28
  6. Step 6: Final answer
    x = 628.98

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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.