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Finding the Fourth Proportional to 939.36, 1,407.96 and 426.72

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Solution

The fourth proportional to 939.36, 1,407.96 and 426.72 is: 639.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.36 : 1,407.96 = 426.72 : x
  2. Step 2: Convert to fraction form
    939.36/1,407.96 = 426.72/x
  3. Step 3: Cross multiply
    939.36x = 1,407.96 × 426.72
  4. Step 4: Simplify right side
    939.36x = 600,804.69
  5. Step 5: Solve for x
    x = 600,804.69/939.36
  6. Step 6: Final answer
    x = 639.59

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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.