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Finding the Fourth Proportional to 878.93, 1,211.63 and 629.81

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Solution

The fourth proportional to 878.93, 1,211.63 and 629.81 is: 868.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.93 : 1,211.63 = 629.81 : x
  2. Step 2: Convert to fraction form
    878.93/1,211.63 = 629.81/x
  3. Step 3: Cross multiply
    878.93x = 1,211.63 × 629.81
  4. Step 4: Simplify right side
    878.93x = 763,087.48
  5. Step 5: Solve for x
    x = 763,087.48/878.93
  6. Step 6: Final answer
    x = 868.21

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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.