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Finding the Fourth Proportional to 763.19, 1,145.11 and 324.74

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Solution

The fourth proportional to 763.19, 1,145.11 and 324.74 is: 487.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.19 : 1,145.11 = 324.74 : x
  2. Step 2: Convert to fraction form
    763.19/1,145.11 = 324.74/x
  3. Step 3: Cross multiply
    763.19x = 1,145.11 × 324.74
  4. Step 4: Simplify right side
    763.19x = 371,863.02
  5. Step 5: Solve for x
    x = 371,863.02/763.19
  6. Step 6: Final answer
    x = 487.25

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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.