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Finding the Fourth Proportional to 676.48, 1,015.08 and 311.24

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Solution

The fourth proportional to 676.48, 1,015.08 and 311.24 is: 467.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.48 : 1,015.08 = 311.24 : x
  2. Step 2: Convert to fraction form
    676.48/1,015.08 = 311.24/x
  3. Step 3: Cross multiply
    676.48x = 1,015.08 × 311.24
  4. Step 4: Simplify right side
    676.48x = 315,933.50
  5. Step 5: Solve for x
    x = 315,933.50/676.48
  6. Step 6: Final answer
    x = 467.03

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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.