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Finding the Fourth Proportional to 763.95, 1,145.78 and 325.12

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Solution

The fourth proportional to 763.95, 1,145.78 and 325.12 is: 487.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.95 : 1,145.78 = 325.12 : x
  2. Step 2: Convert to fraction form
    763.95/1,145.78 = 325.12/x
  3. Step 3: Cross multiply
    763.95x = 1,145.78 × 325.12
  4. Step 4: Simplify right side
    763.95x = 372,511.50
  5. Step 5: Solve for x
    x = 372,511.50/763.95
  6. Step 6: Final answer
    x = 487.61

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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.