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Finding the Fourth Proportional to 1,243.67, 1,863.88 and 513.79

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Solution

The fourth proportional to 1,243.67, 1,863.88 and 513.79 is: 770.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.67 : 1,863.88 = 513.79 : x
  2. Step 2: Convert to fraction form
    1,243.67/1,863.88 = 513.79/x
  3. Step 3: Cross multiply
    1,243.67x = 1,863.88 × 513.79
  4. Step 4: Simplify right side
    1,243.67x = 957,642.91
  5. Step 5: Solve for x
    x = 957,642.91/1,243.67
  6. Step 6: Final answer
    x = 770.01

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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.