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Finding the Fourth Proportional to 538.30, 742.86 and 305.38

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Solution

The fourth proportional to 538.30, 742.86 and 305.38 is: 421.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.30 : 742.86 = 305.38 : x
  2. Step 2: Convert to fraction form
    538.30/742.86 = 305.38/x
  3. Step 3: Cross multiply
    538.30x = 742.86 × 305.38
  4. Step 4: Simplify right side
    538.30x = 226,849.35
  5. Step 5: Solve for x
    x = 226,849.35/538.30
  6. Step 6: Final answer
    x = 421.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.