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Finding the Fourth Proportional to 423.69, 583.68 and 399.09

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Solution

The fourth proportional to 423.69, 583.68 and 399.09 is: 549.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.69 : 583.68 = 399.09 : x
  2. Step 2: Convert to fraction form
    423.69/583.68 = 399.09/x
  3. Step 3: Cross multiply
    423.69x = 583.68 × 399.09
  4. Step 4: Simplify right side
    423.69x = 232,940.85
  5. Step 5: Solve for x
    x = 232,940.85/423.69
  6. Step 6: Final answer
    x = 549.79

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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.