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Finding the Fourth Proportional to 539.10, 743.91 and 318.05

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Solution

The fourth proportional to 539.10, 743.91 and 318.05 is: 438.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.10 : 743.91 = 318.05 : x
  2. Step 2: Convert to fraction form
    539.10/743.91 = 318.05/x
  3. Step 3: Cross multiply
    539.10x = 743.91 × 318.05
  4. Step 4: Simplify right side
    539.10x = 236,596.86
  5. Step 5: Solve for x
    x = 236,596.86/539.10
  6. Step 6: Final answer
    x = 438.87

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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.