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Finding the Fourth Proportional to 940.72, 1,409.64 and 426.64

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Solution

The fourth proportional to 940.72, 1,409.64 and 426.64 is: 639.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.72 : 1,409.64 = 426.64 : x
  2. Step 2: Convert to fraction form
    940.72/1,409.64 = 426.64/x
  3. Step 3: Cross multiply
    940.72x = 1,409.64 × 426.64
  4. Step 4: Simplify right side
    940.72x = 601,408.81
  5. Step 5: Solve for x
    x = 601,408.81/940.72
  6. Step 6: Final answer
    x = 639.31

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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.