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Finding the Fourth Proportional to 765.45, 1,145.88 and 682.43

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Solution

The fourth proportional to 765.45, 1,145.88 and 682.43 is: 1,021.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.45 : 1,145.88 = 682.43 : x
  2. Step 2: Convert to fraction form
    765.45/1,145.88 = 682.43/x
  3. Step 3: Cross multiply
    765.45x = 1,145.88 × 682.43
  4. Step 4: Simplify right side
    765.45x = 781,977.16
  5. Step 5: Solve for x
    x = 781,977.16/765.45
  6. Step 6: Final answer
    x = 1,021.59

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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.