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Finding the Fourth Proportional to 755.10, 1,132.68 and 389.79

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Solution

The fourth proportional to 755.10, 1,132.68 and 389.79 is: 584.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.10 : 1,132.68 = 389.79 : x
  2. Step 2: Convert to fraction form
    755.10/1,132.68 = 389.79/x
  3. Step 3: Cross multiply
    755.10x = 1,132.68 × 389.79
  4. Step 4: Simplify right side
    755.10x = 441,507.34
  5. Step 5: Solve for x
    x = 441,507.34/755.10
  6. Step 6: Final answer
    x = 584.70

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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.