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Finding the Fourth Proportional to 676.70, 1,015.08 and 641.17

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Solution

The fourth proportional to 676.70, 1,015.08 and 641.17 is: 961.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.70 : 1,015.08 = 641.17 : x
  2. Step 2: Convert to fraction form
    676.70/1,015.08 = 641.17/x
  3. Step 3: Cross multiply
    676.70x = 1,015.08 × 641.17
  4. Step 4: Simplify right side
    676.70x = 650,835.60
  5. Step 5: Solve for x
    x = 650,835.60/676.70
  6. Step 6: Final answer
    x = 961.77

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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.