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Finding the Fourth Proportional to 676.33, 1,013.70 and 311.15

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Solution

The fourth proportional to 676.33, 1,013.70 and 311.15 is: 466.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.33 : 1,013.70 = 311.15 : x
  2. Step 2: Convert to fraction form
    676.33/1,013.70 = 311.15/x
  3. Step 3: Cross multiply
    676.33x = 1,013.70 × 311.15
  4. Step 4: Simplify right side
    676.33x = 315,412.76
  5. Step 5: Solve for x
    x = 315,412.76/676.33
  6. Step 6: Final answer
    x = 466.36

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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.