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Finding the Fourth Proportional to 863.42, 1,192.66 and 639.81

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Solution

The fourth proportional to 863.42, 1,192.66 and 639.81 is: 883.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.42 : 1,192.66 = 639.81 : x
  2. Step 2: Convert to fraction form
    863.42/1,192.66 = 639.81/x
  3. Step 3: Cross multiply
    863.42x = 1,192.66 × 639.81
  4. Step 4: Simplify right side
    863.42x = 763,075.79
  5. Step 5: Solve for x
    x = 763,075.79/863.42
  6. Step 6: Final answer
    x = 883.78

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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.