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Finding the Fourth Proportional to 757.79, 1,134.89 and 386.69

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Solution

The fourth proportional to 757.79, 1,134.89 and 386.69 is: 579.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.79 : 1,134.89 = 386.69 : x
  2. Step 2: Convert to fraction form
    757.79/1,134.89 = 386.69/x
  3. Step 3: Cross multiply
    757.79x = 1,134.89 × 386.69
  4. Step 4: Simplify right side
    757.79x = 438,844.96
  5. Step 5: Solve for x
    x = 438,844.96/757.79
  6. Step 6: Final answer
    x = 579.11

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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.