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Finding the Fourth Proportional to 459.80, 636.17 and 389.64

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Solution

The fourth proportional to 459.80, 636.17 and 389.64 is: 539.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.80 : 636.17 = 389.64 : x
  2. Step 2: Convert to fraction form
    459.80/636.17 = 389.64/x
  3. Step 3: Cross multiply
    459.80x = 636.17 × 389.64
  4. Step 4: Simplify right side
    459.80x = 247,872.90
  5. Step 5: Solve for x
    x = 247,872.90/459.80
  6. Step 6: Final answer
    x = 539.09

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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.