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Finding the Fourth Proportional to 765.32, 1,147.97 and 217.55

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Solution

The fourth proportional to 765.32, 1,147.97 and 217.55 is: 326.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.32 : 1,147.97 = 217.55 : x
  2. Step 2: Convert to fraction form
    765.32/1,147.97 = 217.55/x
  3. Step 3: Cross multiply
    765.32x = 1,147.97 × 217.55
  4. Step 4: Simplify right side
    765.32x = 249,744.29
  5. Step 5: Solve for x
    x = 249,744.29/765.32
  6. Step 6: Final answer
    x = 326.33

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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.