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Finding the Fourth Proportional to 874.22, 1,206.77 and 664.43

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Solution

The fourth proportional to 874.22, 1,206.77 and 664.43 is: 917.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.22 : 1,206.77 = 664.43 : x
  2. Step 2: Convert to fraction form
    874.22/1,206.77 = 664.43/x
  3. Step 3: Cross multiply
    874.22x = 1,206.77 × 664.43
  4. Step 4: Simplify right side
    874.22x = 801,804.84
  5. Step 5: Solve for x
    x = 801,804.84/874.22
  6. Step 6: Final answer
    x = 917.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.