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Finding the Fourth Proportional to 756.89, 1,135.38 and 318.09

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Solution

The fourth proportional to 756.89, 1,135.38 and 318.09 is: 477.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.89 : 1,135.38 = 318.09 : x
  2. Step 2: Convert to fraction form
    756.89/1,135.38 = 318.09/x
  3. Step 3: Cross multiply
    756.89x = 1,135.38 × 318.09
  4. Step 4: Simplify right side
    756.89x = 361,153.02
  5. Step 5: Solve for x
    x = 361,153.02/756.89
  6. Step 6: Final answer
    x = 477.16

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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.