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Finding the Fourth Proportional to 939.14, 1,407.10 and 664.78

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Solution

The fourth proportional to 939.14, 1,407.10 and 664.78 is: 996.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.14 : 1,407.10 = 664.78 : x
  2. Step 2: Convert to fraction form
    939.14/1,407.10 = 664.78/x
  3. Step 3: Cross multiply
    939.14x = 1,407.10 × 664.78
  4. Step 4: Simplify right side
    939.14x = 935,411.94
  5. Step 5: Solve for x
    x = 935,411.94/939.14
  6. Step 6: Final answer
    x = 996.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.