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Finding the Fourth Proportional to 761.73, 1,143.20 and 396.64

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Solution

The fourth proportional to 761.73, 1,143.20 and 396.64 is: 595.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.73 : 1,143.20 = 396.64 : x
  2. Step 2: Convert to fraction form
    761.73/1,143.20 = 396.64/x
  3. Step 3: Cross multiply
    761.73x = 1,143.20 × 396.64
  4. Step 4: Simplify right side
    761.73x = 453,438.85
  5. Step 5: Solve for x
    x = 453,438.85/761.73
  6. Step 6: Final answer
    x = 595.28

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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.