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Finding the Fourth Proportional to 459.99, 689.99 and 323.65

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Solution

The fourth proportional to 459.99, 689.99 and 323.65 is: 485.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.99 : 689.99 = 323.65 : x
  2. Step 2: Convert to fraction form
    459.99/689.99 = 323.65/x
  3. Step 3: Cross multiply
    459.99x = 689.99 × 323.65
  4. Step 4: Simplify right side
    459.99x = 223,310.20
  5. Step 5: Solve for x
    x = 223,310.20/459.99
  6. Step 6: Final answer
    x = 485.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.