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Finding the Fourth Proportional to 914.44, 1,372.34 and 427.83

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Solution

The fourth proportional to 914.44, 1,372.34 and 427.83 is: 642.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    914.44 : 1,372.34 = 427.83 : x
  2. Step 2: Convert to fraction form
    914.44/1,372.34 = 427.83/x
  3. Step 3: Cross multiply
    914.44x = 1,372.34 × 427.83
  4. Step 4: Simplify right side
    914.44x = 587,131.86
  5. Step 5: Solve for x
    x = 587,131.86/914.44
  6. Step 6: Final answer
    x = 642.07

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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.