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Finding the Fourth Proportional to 765.32, 1,147.59 and 326.40

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Solution

The fourth proportional to 765.32, 1,147.59 and 326.40 is: 489.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.32 : 1,147.59 = 326.40 : x
  2. Step 2: Convert to fraction form
    765.32/1,147.59 = 326.40/x
  3. Step 3: Cross multiply
    765.32x = 1,147.59 × 326.40
  4. Step 4: Simplify right side
    765.32x = 374,573.38
  5. Step 5: Solve for x
    x = 374,573.38/765.32
  6. Step 6: Final answer
    x = 489.44

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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.