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Finding the Fourth Proportional to 943.43, 1,302.14 and 644.54

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Solution

The fourth proportional to 943.43, 1,302.14 and 644.54 is: 889.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.43 : 1,302.14 = 644.54 : x
  2. Step 2: Convert to fraction form
    943.43/1,302.14 = 644.54/x
  3. Step 3: Cross multiply
    943.43x = 1,302.14 × 644.54
  4. Step 4: Simplify right side
    943.43x = 839,276.42
  5. Step 5: Solve for x
    x = 839,276.42/943.43
  6. Step 6: Final answer
    x = 889.61

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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.