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Finding the Fourth Proportional to 676.20, 1,013.54 and 401.79

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Solution

The fourth proportional to 676.20, 1,013.54 and 401.79 is: 602.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.20 : 1,013.54 = 401.79 : x
  2. Step 2: Convert to fraction form
    676.20/1,013.54 = 401.79/x
  3. Step 3: Cross multiply
    676.20x = 1,013.54 × 401.79
  4. Step 4: Simplify right side
    676.20x = 407,228.23
  5. Step 5: Solve for x
    x = 407,228.23/676.20
  6. Step 6: Final answer
    x = 602.23

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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.