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Finding the Fourth Proportional to 443.99, 613.98 and 399.65

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Solution

The fourth proportional to 443.99, 613.98 and 399.65 is: 552.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.99 : 613.98 = 399.65 : x
  2. Step 2: Convert to fraction form
    443.99/613.98 = 399.65/x
  3. Step 3: Cross multiply
    443.99x = 613.98 × 399.65
  4. Step 4: Simplify right side
    443.99x = 245,374.04
  5. Step 5: Solve for x
    x = 245,374.04/443.99
  6. Step 6: Final answer
    x = 552.65

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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.