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Finding the Fourth Proportional to 756.75, 1,135.40 and 243.75

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Solution

The fourth proportional to 756.75, 1,135.40 and 243.75 is: 365.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.75 : 1,135.40 = 243.75 : x
  2. Step 2: Convert to fraction form
    756.75/1,135.40 = 243.75/x
  3. Step 3: Cross multiply
    756.75x = 1,135.40 × 243.75
  4. Step 4: Simplify right side
    756.75x = 276,752.53
  5. Step 5: Solve for x
    x = 276,752.53/756.75
  6. Step 6: Final answer
    x = 365.71

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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.