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Finding the Fourth Proportional to 756.72, 1,135.32 and 323.76

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Solution

The fourth proportional to 756.72, 1,135.32 and 323.76 is: 485.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.72 : 1,135.32 = 323.76 : x
  2. Step 2: Convert to fraction form
    756.72/1,135.32 = 323.76/x
  3. Step 3: Cross multiply
    756.72x = 1,135.32 × 323.76
  4. Step 4: Simplify right side
    756.72x = 367,571.20
  5. Step 5: Solve for x
    x = 367,571.20/756.72
  6. Step 6: Final answer
    x = 485.74

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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.