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Finding the Fourth Proportional to 765.45, 1,148.37 and 326.48

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Solution

The fourth proportional to 765.45, 1,148.37 and 326.48 is: 489.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.45 : 1,148.37 = 326.48 : x
  2. Step 2: Convert to fraction form
    765.45/1,148.37 = 326.48/x
  3. Step 3: Cross multiply
    765.45x = 1,148.37 × 326.48
  4. Step 4: Simplify right side
    765.45x = 374,919.84
  5. Step 5: Solve for x
    x = 374,919.84/765.45
  6. Step 6: Final answer
    x = 489.80

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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.