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Finding the Fourth Proportional to 481.18, 718.72 and 427.42

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Solution

The fourth proportional to 481.18, 718.72 and 427.42 is: 638.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.18 : 718.72 = 427.42 : x
  2. Step 2: Convert to fraction form
    481.18/718.72 = 427.42/x
  3. Step 3: Cross multiply
    481.18x = 718.72 × 427.42
  4. Step 4: Simplify right side
    481.18x = 307,195.30
  5. Step 5: Solve for x
    x = 307,195.30/481.18
  6. Step 6: Final answer
    x = 638.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.