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Finding the Fourth Proportional to 538.98, 743.76 and 318

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Solution

The fourth proportional to 538.98, 743.76 and 318 is: 438.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.98 : 743.76 = 318 : x
  2. Step 2: Convert to fraction form
    538.98/743.76 = 318/x
  3. Step 3: Cross multiply
    538.98x = 743.76 × 318
  4. Step 4: Simplify right side
    538.98x = 236,515.68
  5. Step 5: Solve for x
    x = 236,515.68/538.98
  6. Step 6: Final answer
    x = 438.82

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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.