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Finding the Fourth Proportional to 761.79, 1,143.14 and 396.71

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Solution

The fourth proportional to 761.79, 1,143.14 and 396.71 is: 595.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.79 : 1,143.14 = 396.71 : x
  2. Step 2: Convert to fraction form
    761.79/1,143.14 = 396.71/x
  3. Step 3: Cross multiply
    761.79x = 1,143.14 × 396.71
  4. Step 4: Simplify right side
    761.79x = 453,487.37
  5. Step 5: Solve for x
    x = 453,487.37/761.79
  6. Step 6: Final answer
    x = 595.29

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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.