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Finding the Fourth Proportional to 755.38, 1,132.29 and 389.35

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Solution

The fourth proportional to 755.38, 1,132.29 and 389.35 is: 583.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.38 : 1,132.29 = 389.35 : x
  2. Step 2: Convert to fraction form
    755.38/1,132.29 = 389.35/x
  3. Step 3: Cross multiply
    755.38x = 1,132.29 × 389.35
  4. Step 4: Simplify right side
    755.38x = 440,857.11
  5. Step 5: Solve for x
    x = 440,857.11/755.38
  6. Step 6: Final answer
    x = 583.62

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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.