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Finding the Fourth Proportional to 763.56, 1,145.12 and 640.94

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Solution

The fourth proportional to 763.56, 1,145.12 and 640.94 is: 961.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.56 : 1,145.12 = 640.94 : x
  2. Step 2: Convert to fraction form
    763.56/1,145.12 = 640.94/x
  3. Step 3: Cross multiply
    763.56x = 1,145.12 × 640.94
  4. Step 4: Simplify right side
    763.56x = 733,944.28
  5. Step 5: Solve for x
    x = 733,944.28/763.56
  6. Step 6: Final answer
    x = 961.21

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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.