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Finding the Fourth Proportional to 756.96, 1,135.20 and 324

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Solution

The fourth proportional to 756.96, 1,135.20 and 324 is: 485.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.96 : 1,135.20 = 324 : x
  2. Step 2: Convert to fraction form
    756.96/1,135.20 = 324/x
  3. Step 3: Cross multiply
    756.96x = 1,135.20 × 324
  4. Step 4: Simplify right side
    756.96x = 367,804.80
  5. Step 5: Solve for x
    x = 367,804.80/756.96
  6. Step 6: Final answer
    x = 485.90

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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.