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Finding the Fourth Proportional to 940.36, 1,409.46 and 427.72

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Solution

The fourth proportional to 940.36, 1,409.46 and 427.72 is: 641.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.36 : 1,409.46 = 427.72 : x
  2. Step 2: Convert to fraction form
    940.36/1,409.46 = 427.72/x
  3. Step 3: Cross multiply
    940.36x = 1,409.46 × 427.72
  4. Step 4: Simplify right side
    940.36x = 602,854.23
  5. Step 5: Solve for x
    x = 602,854.23/940.36
  6. Step 6: Final answer
    x = 641.09

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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.