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Finding the Fourth Proportional to 763.65, 1,145.20 and 330.57

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Solution

The fourth proportional to 763.65, 1,145.20 and 330.57 is: 495.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.65 : 1,145.20 = 330.57 : x
  2. Step 2: Convert to fraction form
    763.65/1,145.20 = 330.57/x
  3. Step 3: Cross multiply
    763.65x = 1,145.20 × 330.57
  4. Step 4: Simplify right side
    763.65x = 378,568.76
  5. Step 5: Solve for x
    x = 378,568.76/763.65
  6. Step 6: Final answer
    x = 495.74

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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.