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Finding the Fourth Proportional to 763.78, 1,145.94 and 250.78

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Solution

The fourth proportional to 763.78, 1,145.94 and 250.78 is: 376.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.78 : 1,145.94 = 250.78 : x
  2. Step 2: Convert to fraction form
    763.78/1,145.94 = 250.78/x
  3. Step 3: Cross multiply
    763.78x = 1,145.94 × 250.78
  4. Step 4: Simplify right side
    763.78x = 287,378.83
  5. Step 5: Solve for x
    x = 287,378.83/763.78
  6. Step 6: Final answer
    x = 376.26

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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.