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Finding the Fourth Proportional to 863.22, 1,188.75 and 640.89

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Solution

The fourth proportional to 863.22, 1,188.75 and 640.89 is: 882.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.22 : 1,188.75 = 640.89 : x
  2. Step 2: Convert to fraction form
    863.22/1,188.75 = 640.89/x
  3. Step 3: Cross multiply
    863.22x = 1,188.75 × 640.89
  4. Step 4: Simplify right side
    863.22x = 761,857.99
  5. Step 5: Solve for x
    x = 761,857.99/863.22
  6. Step 6: Final answer
    x = 882.58

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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.