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Finding the Fourth Proportional to 940.05, 1,409.06 and 392.09

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Solution

The fourth proportional to 940.05, 1,409.06 and 392.09 is: 587.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.05 : 1,409.06 = 392.09 : x
  2. Step 2: Convert to fraction form
    940.05/1,409.06 = 392.09/x
  3. Step 3: Cross multiply
    940.05x = 1,409.06 × 392.09
  4. Step 4: Simplify right side
    940.05x = 552,472.27
  5. Step 5: Solve for x
    x = 552,472.27/940.05
  6. Step 6: Final answer
    x = 587.71

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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.