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Finding the Fourth Proportional to 408.99, 609.59 and 385.93

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Solution

The fourth proportional to 408.99, 609.59 and 385.93 is: 575.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.99 : 609.59 = 385.93 : x
  2. Step 2: Convert to fraction form
    408.99/609.59 = 385.93/x
  3. Step 3: Cross multiply
    408.99x = 609.59 × 385.93
  4. Step 4: Simplify right side
    408.99x = 235,259.07
  5. Step 5: Solve for x
    x = 235,259.07/408.99
  6. Step 6: Final answer
    x = 575.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.