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Finding the Fourth Proportional to 539.10, 743.90 and 318.11

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Solution

The fourth proportional to 539.10, 743.90 and 318.11 is: 438.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.10 : 743.90 = 318.11 : x
  2. Step 2: Convert to fraction form
    539.10/743.90 = 318.11/x
  3. Step 3: Cross multiply
    539.10x = 743.90 × 318.11
  4. Step 4: Simplify right side
    539.10x = 236,636.72
  5. Step 5: Solve for x
    x = 236,636.72/539.10
  6. Step 6: Final answer
    x = 438.95

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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.