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Finding the Fourth Proportional to 699.57, 961.36 and 667.45

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Solution

The fourth proportional to 699.57, 961.36 and 667.45 is: 917.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.57 : 961.36 = 667.45 : x
  2. Step 2: Convert to fraction form
    699.57/961.36 = 667.45/x
  3. Step 3: Cross multiply
    699.57x = 961.36 × 667.45
  4. Step 4: Simplify right side
    699.57x = 641,656.39
  5. Step 5: Solve for x
    x = 641,656.39/699.57
  6. Step 6: Final answer
    x = 917.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.