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Finding the Fourth Proportional to 754.81, 1,134.20 and 389.84

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Solution

The fourth proportional to 754.81, 1,134.20 and 389.84 is: 585.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.81 : 1,134.20 = 389.84 : x
  2. Step 2: Convert to fraction form
    754.81/1,134.20 = 389.84/x
  3. Step 3: Cross multiply
    754.81x = 1,134.20 × 389.84
  4. Step 4: Simplify right side
    754.81x = 442,151.83
  5. Step 5: Solve for x
    x = 442,151.83/754.81
  6. Step 6: Final answer
    x = 585.78

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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.