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Finding the Fourth Proportional to 1,241.61, 1,863 and 511.71

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Solution

The fourth proportional to 1,241.61, 1,863 and 511.71 is: 767.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.61 : 1,863 = 511.71 : x
  2. Step 2: Convert to fraction form
    1,241.61/1,863 = 511.71/x
  3. Step 3: Cross multiply
    1,241.61x = 1,863 × 511.71
  4. Step 4: Simplify right side
    1,241.61x = 953,315.73
  5. Step 5: Solve for x
    x = 953,315.73/1,241.61
  6. Step 6: Final answer
    x = 767.81

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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.