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Finding the Fourth Proportional to 756.64, 1,135.56 and 323.86

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Solution

The fourth proportional to 756.64, 1,135.56 and 323.86 is: 486.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.64 : 1,135.56 = 323.86 : x
  2. Step 2: Convert to fraction form
    756.64/1,135.56 = 323.86/x
  3. Step 3: Cross multiply
    756.64x = 1,135.56 × 323.86
  4. Step 4: Simplify right side
    756.64x = 367,762.46
  5. Step 5: Solve for x
    x = 367,762.46/756.64
  6. Step 6: Final answer
    x = 486.05

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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.