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Finding the Fourth Proportional to 943.81, 1,302.92 and 664.29

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Solution

The fourth proportional to 943.81, 1,302.92 and 664.29 is: 917.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.81 : 1,302.92 = 664.29 : x
  2. Step 2: Convert to fraction form
    943.81/1,302.92 = 664.29/x
  3. Step 3: Cross multiply
    943.81x = 1,302.92 × 664.29
  4. Step 4: Simplify right side
    943.81x = 865,516.73
  5. Step 5: Solve for x
    x = 865,516.73/943.81
  6. Step 6: Final answer
    x = 917.05

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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.