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Finding the Fourth Proportional to 756.68, 1,134.78 and 243.56

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Solution

The fourth proportional to 756.68, 1,134.78 and 243.56 is: 365.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.68 : 1,134.78 = 243.56 : x
  2. Step 2: Convert to fraction form
    756.68/1,134.78 = 243.56/x
  3. Step 3: Cross multiply
    756.68x = 1,134.78 × 243.56
  4. Step 4: Simplify right side
    756.68x = 276,387.02
  5. Step 5: Solve for x
    x = 276,387.02/756.68
  6. Step 6: Final answer
    x = 365.26

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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.