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Finding the Fourth Proportional to 676.68, 1,013.60 and 311.78

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Solution

The fourth proportional to 676.68, 1,013.60 and 311.78 is: 467.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.68 : 1,013.60 = 311.78 : x
  2. Step 2: Convert to fraction form
    676.68/1,013.60 = 311.78/x
  3. Step 3: Cross multiply
    676.68x = 1,013.60 × 311.78
  4. Step 4: Simplify right side
    676.68x = 316,020.21
  5. Step 5: Solve for x
    x = 316,020.21/676.68
  6. Step 6: Final answer
    x = 467.02

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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.