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Finding the Fourth Proportional to 867.22, 1,196.72 and 494.21

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Solution

The fourth proportional to 867.22, 1,196.72 and 494.21 is: 681.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.22 : 1,196.72 = 494.21 : x
  2. Step 2: Convert to fraction form
    867.22/1,196.72 = 494.21/x
  3. Step 3: Cross multiply
    867.22x = 1,196.72 × 494.21
  4. Step 4: Simplify right side
    867.22x = 591,431.51
  5. Step 5: Solve for x
    x = 591,431.51/867.22
  6. Step 6: Final answer
    x = 681.99

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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.