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Finding the Fourth Proportional to 765.57, 1,148.11 and 326.82

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Solution

The fourth proportional to 765.57, 1,148.11 and 326.82 is: 490.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.57 : 1,148.11 = 326.82 : x
  2. Step 2: Convert to fraction form
    765.57/1,148.11 = 326.82/x
  3. Step 3: Cross multiply
    765.57x = 1,148.11 × 326.82
  4. Step 4: Simplify right side
    765.57x = 375,225.31
  5. Step 5: Solve for x
    x = 375,225.31/765.57
  6. Step 6: Final answer
    x = 490.13

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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.