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Finding the Fourth Proportional to 438.75, 605.07 and 399.51

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Solution

The fourth proportional to 438.75, 605.07 and 399.51 is: 550.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.75 : 605.07 = 399.51 : x
  2. Step 2: Convert to fraction form
    438.75/605.07 = 399.51/x
  3. Step 3: Cross multiply
    438.75x = 605.07 × 399.51
  4. Step 4: Simplify right side
    438.75x = 241,731.52
  5. Step 5: Solve for x
    x = 241,731.52/438.75
  6. Step 6: Final answer
    x = 550.96

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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.