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Finding the Fourth Proportional to 538.98, 743.88 and 306.12

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Solution

The fourth proportional to 538.98, 743.88 and 306.12 is: 422.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.98 : 743.88 = 306.12 : x
  2. Step 2: Convert to fraction form
    538.98/743.88 = 306.12/x
  3. Step 3: Cross multiply
    538.98x = 743.88 × 306.12
  4. Step 4: Simplify right side
    538.98x = 227,716.55
  5. Step 5: Solve for x
    x = 227,716.55/538.98
  6. Step 6: Final answer
    x = 422.50

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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.