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Finding the Fourth Proportional to 754.05, 1,131.80 and 389.10

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Solution

The fourth proportional to 754.05, 1,131.80 and 389.10 is: 584.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.05 : 1,131.80 = 389.10 : x
  2. Step 2: Convert to fraction form
    754.05/1,131.80 = 389.10/x
  3. Step 3: Cross multiply
    754.05x = 1,131.80 × 389.10
  4. Step 4: Simplify right side
    754.05x = 440,381.43
  5. Step 5: Solve for x
    x = 440,381.43/754.05
  6. Step 6: Final answer
    x = 584.02

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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.